Intel FPGA Programmable Acceleration Card N3000 Daim Ntawv Qhia Tus Neeg Siv
Taw qhia
Keeb kwm
Intel FPGA Programmable Acceleration Card N3000 hauv lub xov tooj cua virtualized nkag network (vRAN) xav tau kev txhawb nqa rau IEEE1588v2 raws li Precision Time Protocol (PTP) Telecom Slave Clocks (T-TSC) los teem sijhawm software ua haujlwm kom tsim nyog. Intel Ethernet Controller XL710 hauv Intel® FPGA PAC N3000 muab kev txhawb nqa IEEE1588v2. Txawm li cas los xij, FPGA cov ntaub ntawv txoj kev qhia txog kev ntxhov siab uas cuam tshuam rau PTP kev ua tau zoo. Ntxiv lub pob tshab moos (T-TC) Circuit Court ua rau Intel FPGA PAC N3000 los them nyiaj rau nws FPGA sab hauv latency thiab txo qhov cuam tshuam ntawm qhov jitter, uas tso cai rau T-TSC kom kwv yees Grandmaster Lub Sij Hawm Hnub (ToD) zoo.
Lub hom phiaj
Cov kev sim no siv tau rau kev siv Intel FPGA PAC N3000 ua tus qhev IEEE1588v2 hauv Open Radio Access Network (O-RAN). Cov ntaub ntawv no piav qhia txog:
- Kev teeb tsa
- Cov txheej txheem pov thawj
- Kev ntsuas kev ua tau zoo ntawm pob tshab moos mechanism hauv FPGA txoj hauv kev ntawm Intel FPGA PAC N3000
- PTP kev ua tau zoo ntawm Intel FPGA PAC N3000 Kev ua haujlwm ntawm Intel FPGA PAC N3000 txhawb nqa lub moos pob tshab yog
piv nrog Intel FPGA PAC N3000 yam tsis muaj lub moos pob tshab nrog rau lwm daim npav Ethernet XXV710 nyob rau hauv ntau yam kev khiav tsheb thiab PTP teeb tsa.
Nta thiab Kev Txwv
Cov yam ntxwv thiab kev txwv tsis pub siv rau Intel FPGA PAC N3000 IEEE1588v2 kev txhawb nqa yog raws li hauv qab no:
- Software pawg siv: Linux PTP Project (PTP4l)
- Txhawb cov hauv qab no telecom profiles:
- 1588v2 (default)
- g.8265.1 ua
- g.8275.1 ua
- Txhawb ob-kauj ruam PTP qhev moos.
Intel Corporation. Txhua txoj cai. Intel, Intel logo, thiab lwm yam Intel cov cim yog cov cim lag luam ntawm Intel Corporation lossis nws cov koom haum. Intel lav kev ua tau zoo ntawm nws cov FPGA thiab cov khoom lag luam semiconductor rau cov kev qhia tshwj xeeb tam sim no raws li Intel tus qauv kev lees paub, tab sis muaj txoj cai los hloov cov khoom thiab cov kev pabcuam txhua lub sijhawm yam tsis muaj ntawv ceeb toom. Intel xav tias tsis muaj lub luag haujlwm lossis kev lav phib xaub uas tshwm sim los ntawm daim ntawv thov lossis siv cov ntaub ntawv, cov khoom lag luam, lossis cov kev pabcuam uas tau piav qhia hauv no tshwj tsis yog raws li tau pom zoo hauv kev sau ntawv los ntawm Intel. Intel cov neeg siv khoom tau qhia kom tau txais qhov tseeb version ntawm cov cuab yeej tshwj xeeb ua ntej tso siab rau cov ntaub ntawv tshaj tawm thiab ua ntej muab xaj rau cov khoom lossis cov kev pabcuam. * Lwm lub npe thiab hom yuav raug lees paub raws li cov cuab yeej ntawm lwm tus.
- Txhawb qhov kawg-rau-kawg multicast hom.
- Txhawb PTP cov lus sib pauv zaus txog li 128 Hz.
- Qhov no yog ib qho kev txwv ntawm txoj kev npaj validation thiab ua hauj lwm Grandmaster. PTP configurations siab tshaj 128 pob ntawv ib ob rau PTP lus tej zaum yuav ua tau.
- Vim muaj kev txwv ntawm Cisco* Nexus* 93180YC-FX hloov siv nyob rau hauv lub validation setup, cov kev ua tau zoo nyob rau hauv iperf3 tsheb tej yam kev mob xa mus rau PTP lus pauv tus nqi ntawm 8 Hz.
- Kev them nyiaj yug Encapsulation:
- Thauj dhau L2 (raw Ethernet) thiab L3 (UDP / IPv4 / IPv6)
Nco tseg: Hauv daim ntawv no, tag nrho cov txiaj ntsig siv ib qho 25Gbps Ethernet txuas.
- Thauj dhau L2 (raw Ethernet) thiab L3 (UDP / IPv4 / IPv6)
Cov cuab yeej thiab Tsav Tsheb Versions
| Cov cuab yeej | Version |
| BIOS | Intel Server Board S2600WF 00.01.0013 |
| OS | CentOS 7.6 |
| Kernel | kernel-rt-3.10.0-693.2.2.rt56.623.el7.src. |
| Cov ntaub ntawv dav hlau loj hlob (DPDK) | 18.08 |
| Intel C Compiler | 19.0.3 |
| Intel XL710 Driver (i40e tsav) | 2.8.432.9.21 |
| PTP 4l | 2.0 |
| IxExplorer | 8.51.1800.7 EA-Patch1 |
| lperf 3 | 3.0.11 |
| trafgen | Netsniff-ng 0.6.6 Toolkit |
IXIA Traffic Test
Thawj cov txheej txheem ntawm PTP kev ua tau zoo rau Intel FPGA PAC N3000 siv IXIA * kev daws teeb meem rau kev sib koom tes thiab PTP kev sib tw. Lub thawv IXIA XGS2 chassis suav nrog IXIA 40 PORT NOVUS-R100GE8Q28 daim npav thiab IxExplorer uas muab cov duab kos duab rau kev teeb tsa virtual PTP Grandmaster rau DUT (Intel FPGA PAC N3000) dhau ib zaug 25 Gbps ncaj qha Ethernet kev sib txuas. Daim duab thaiv hauv qab no qhia txog lub hom phiaj ntsuas topology rau IXIA-based benchmarks. Tag nrho cov txiaj ntsig tau siv IXIA-tsim tsheb khiav mus rau qhov kev xeem tsheb ingress thiab siv cov cuab yeej trafgen ntawm Intel FPGA PAC N3000 tus tswv tsev rau kev kuaj tsheb khiav tawm, qhov twg qhov kev nkag lossis kev coj mus yog ib txwm los ntawm kev xav ntawm DUT (Intel FPGA PAC N3000. ) host. Nyob rau hauv ob qho tib si, qhov nruab nrab tsheb khiav yog 24 Gbps. Qhov kev sim teeb tsa no muab lub hauv paus tus yam ntxwv ntawm PTP kev ua tau zoo ntawm Intel FPGA PAC N3000 nrog T-TC mechanism enabled, nrog rau muab piv rau cov tsis-TC Intel FPGA PAC N3000 Hoobkas duab hauv qab ITU-T G.8275.1 PTP profile.
Topology rau Intel FPGA PAC N3000 Kev Ntsuam Xyuas Tsheb hauv qab IXIA Virtual Grandmaster
IXIA Traffic Test Result
Cov kev soj ntsuam hauv qab no ntes PTP kev ua tau zoo ntawm TC-enabled Intel FPGA PAC N3000 nyob rau hauv ingress thiab egress tsheb. Hauv seem no, PTP profile G.8275.1 tau txais kev pom zoo rau txhua qhov kev sim tsheb khiav thiab sau cov ntaub ntawv.
Magnitude ntawm Master Offset
Cov duab hauv qab no qhia tau hais tias qhov loj ntawm tus tswv offset tau pom los ntawm PTP4l qhev tus neeg siv khoom ntawm Intel FPGA PAC N3000 tus tswv tsev ua haujlwm ntawm lub sijhawm dhau mus nyob rau hauv ingress, egress thiab bidirectional tsheb (qhov nruab nrab ntawm 24.4Gbps).
Txoj Kev Delay (MPD)
Cov duab hauv qab no qhia tau hais tias txoj kev ncua sij hawm, raws li xam los ntawm PTP4 qhev uas siv Intel FPGA PAC N3000 raws li daim npav network interface, rau tib qhov kev sim raws li daim duab saum toj no. Lub sijhawm tag nrho ntawm txhua qhov ntawm peb qhov kev xeem tsheb yog tsawg kawg 16 teev.
Cov lus hauv qab no teev cov kev txheeb xyuas kev txheeb xyuas ntawm peb qhov kev xeem tsheb. Raws li kev thauj mus los ze rau lub peev xwm channel, PTP4l qhev uas siv Intel FPGA PAC N3000 tuav nws theem offset rau IXIA tus virtual grandmaster nyob rau hauv 53 ns rau tag nrho cov kev xeem tsheb. Tsis tas li ntawd, tus qauv sib txawv ntawm tus tswv offset magnitude yog qis dua 5 ns.
Cov ntaub ntawv txheeb cais ntawm PTP Kev Ua Haujlwm
| G.8275.1 PTP Profile | Ingress Traffic (24Gbps) | Egress Traffic (24Gbps) | Tsheb thauj mus los Bidirectional (24Gbps) |
| RMS | 6.35 ib ns | 8.4 ib ns | 9.2 ib ns |
| StdDev (ntawm abs (max) offset) | 3.68 ib ns | 3.78 ib ns | 4.5 ib ns |
| StdDev (ntawm MPD) | 1.78 ib ns | 2.1 ib ns | 2.38 ib ns |
| Max offset | 36 ib ns | 33 ib ns | 53 ib ns |
Cov duab hauv qab no sawv cev rau qhov loj ntawm tus tswv offset thiab qhov nruab nrab txoj kev ncua (MPD), nyob rau hauv 16-teev ntev 24 Gbps bidirectional kev kuaj tsheb rau txawv PTP encapsulations. Cov duab sab laug hauv cov duab no xa mus rau PTP cov qauv ntsuas raws li IPv4 / UDP encapsulation, thaum PTP kev xa xov encapsulation ntawm cov duab sab xis yog nyob rau hauv L2 (raw Ethernet). PTP4l qhev kev ua tau zoo yog qhov zoo sib xws, qhov phem tshaj tus tswv offset magnitude yog 53 ns thiab 45 ns rau IPv4 / UDP thiab L2 encapsulation, feem. Tus qauv sib txawv ntawm qhov sib txawv ntawm qhov loj yog 4.49 ns thiab 4.55 ns rau IPv4 / UDP thiab L2 encapsulation, feem.
Magnitude ntawm Master Offset
Cov duab hauv qab no qhia qhov loj ntawm tus tswv offset nyob rau hauv 24 Gbps bidirectional tsheb, IPv4 (sab laug) thiab L2 (txoj cai) encapsulation, G8275.1 Profile.
Txoj Kev Delay (MPD)
Cov duab hauv qab no qhia txog txoj kev ncua sij hawm ntawm Intel FPGA PAC N3000 tus tswv PTP4l qhev hauv qab 24 Gbps bidirectional tsheb, IPv4 (sab laug) thiab L2 (txoj cai) encapsulation, G8275.1 Profile.
Qhov tseem ceeb ntawm MPD tsis yog qhov qhia meej ntawm PTP qhov sib xws, vim nws nyob ntawm qhov ntev cables, cov ntaub ntawv txoj kev latency thiab lwm yam; Txawm li cas los xij, saib qhov kev hloov pauv MPD qis (2.381 ns thiab 2.377 ns rau IPv4 thiab L2 rooj plaub, feem) ua rau nws pom tseeb tias PTP MPD suav yog qhov tseeb tsis tu ncua thoob plaws ob lub encapsulations. Nws txheeb xyuas qhov sib xws ntawm PTP kev ua haujlwm thoob plaws ob hom encapsulation. Cov qib hloov pauv hauv MPD suav hauv L2 daim duab (hauv daim duab saum toj no, txoj cai daim duab) yog vim muaj kev cuam tshuam ntxiv ntawm kev siv tsheb. Ua ntej, cov channel tsis ua haujlwm (MPD rms yog 55.3 ns), tom qab ntawd ingress tsheb yog siv (thib ob incremental kauj ruam, MPD rms yog 85.44 ns), ua raws li ib txhij egress tsheb, ua rau ib tug xam MPD ntawm 108.98 ns. Cov duab hauv qab no overlay qhov loj ntawm tus tswv offset thiab xam MPD ntawm kev sib tw tsheb sib tw ua haujlwm rau ob qho tib si PTP4l qhev siv Intel FPGA PAC N3000 nrog T-TC mechanism, nrog rau lwm tus uas siv Intel FPGA PACN3000 yam tsis muaj TC kev ua haujlwm. T-TC Intel FPGA PAC N3000 kev xeem (txiv kab ntxwv) pib los ntawm lub sij hawm xoom, thaum lub PTP xeem uas siv cov tsis-TC Intel FPGA PAC N3000 (xiav) pib nyob ib ncig ntawm T = 2300 vib nas this.
Magnitude ntawm Master Offset
Cov duab hauv qab no qhia qhov loj ntawm tus tswv offset nyob rau hauv Ingress tsheb (24 Gbps), nrog thiab tsis muaj TTC kev txhawb nqa, G.8275.1 Profile.
Nyob rau hauv daim duab saum toj no, PTP kev ua tau zoo ntawm TC-enabled Intel FPGA PAC N3000 nyob rau hauv kev tsheb yog zoo ib yam li cov tsis-TC Intel FPGA PAC N3000 rau thawj 2300 vib nas this. Qhov ua tau zoo ntawm T-TC mechanism hauv Intel FPGA PAC N3000 yog qhov tseem ceeb hauv ntu ntawm kev xeem (tom qab 2300 thib ob) qhov sib npaug ntawm cov tsheb thauj khoom siv rau kev sib tshuam ntawm ob daim npav. Ib yam li hauv daim duab hauv qab no, MPD suav nrog ua ntej thiab tom qab siv cov tsheb khiav ntawm cov channel. Qhov ua tau zoo ntawm T-TC mechanism yog qhov tseem ceeb hauv kev them nyiaj rau lub sijhawm nyob ntawm cov pob ntawv uas yog pob ntawv latency los ntawm FPGA txoj kev ntawm 25G thiab 40G MACs.
Txoj Kev Delay (MPD)
Cov duab hauv qab no qhia txog txoj kev ncua sij hawm ntawm Intel FPGA PAC N3000 tus tswv tsev PTP4l qhev nyob rau hauv Ingress tsheb (24 Gbps), nrog thiab tsis muaj T-TC kev txhawb nqa, G.8275.1 Profile.
Cov duab no qhia txog PTP4l qhev lub servo algorithm, vim lub sij hawm nyob rau hauv kev kho ntawm TC, peb pom me me sib txawv nyob rau hauv nruab nrab txoj kev ncua xam. Yog li ntawd, qhov cuam tshuam ntawm kev ncua kev hloov pauv ntawm tus tswv offset approximation raug txo. Cov lus hauv qab no teev cov ntaub ntawv txheeb xyuas ntawm PTP kev ua tau zoo, uas suav nrog RMS thiab tus qauv sib txawv ntawm tus tswv offset, tus qauv sib txawv ntawm txoj kev ncua sij hawm, nrog rau qhov phem tshaj tus tswv offset rau Intel FPGA PAC N3000 nrog thiab tsis muaj T- TC kev txhawb nqa.
Cov ntaub ntawv txheeb cais ntawm PTP Kev Ua Haujlwm Raws Li Ingress Traffic
| Ingress Traffic (24Gbps) G.8275.1 PTP Profile | Intel FPGA PAC N3000 nrog T-TC | Intel FPGA PAC N3000 tsis muaj T-TC |
| RMS | 6.34 ib ns | 40.5 ib ns |
| StdDev (ntawm abs (max) offset) | 3.65 ib ns | 15.5 ib ns |
| StdDev (ntawm MPD) | 1.79 ib ns | 18.1 ib ns |
| Max offset | 34 ib ns | 143 ib ns |
Kev sib piv ncaj qha rau TC-txhawb Intel FPGA PAC N3000 rau qhov tsis yog-TC version
Qhia tau tias PTP kev ua tau zoo yog 4x rau 6x qis dua nrog rau ib qho ntawm cov kev txheeb cais
metrics (qhov phem tshaj plaws, RMS lossis tus qauv sib txawv ntawm tus tswv offset). Qhov phem tshaj plaws
master offset rau G.8275.1 PTP teeb tsa ntawm T-TC Intel FPGA PAC N3000 yog 34
ns nyob rau hauv ingress tsheb thauj mus los ntawm qhov txwv ntawm channel bandwidth (24.4Gbps).
lperf3 Traffic Test
Tshooj lus no piav qhia txog kev ntsuas kev sib tw ntawm iperf3 kom ntsuas qhov kev ua tau zoo ntawm PTP ntawm Intel FPGA PAC N3000. Lub cuab yeej iperf3 tau raug siv los ua cov txheej txheem tsheb khiav. Lub network topology ntawm iperf3 cov qauv kev sib tw, qhia hauv daim duab hauv qab no, suav nrog kev sib txuas ntawm ob lub servers, txhua tus siv daim npav DUT (Intel FPGA PAC N3000 thiab XXV710), rau Cisco Nexus 93180YC FX hloov. Lub Cisco hloov ua raws li Lub Sij Hawm Ciam Teb (T-BC) ntawm ob DUT PTP qhev thiab Calnex Paragon-NEO Grandmaster.
Network Topology rau Intel FPGA PAC N3000 lperf3 Traffic Test
PTP4l tso zis ntawm txhua tus ntawm DUT hosts muab cov ntaub ntawv ntsuas ntawm PTP kev ua tau zoo rau txhua tus qhev ntaus ntawv hauv kev teeb tsa (Intel FPGA PAC N3000 thiab XXV710). Rau iperf3 kev xeem tsheb, cov xwm txheej hauv qab no thiab teeb tsa siv tau rau txhua daim duab thiab kev ntsuas kev ua haujlwm:
- 17 Gbps aggregated bandwidth ntawm kev khiav tsheb (ob leeg TCP thiab UDP), egress lossis ingress lossis bidirectional rau Intel FPGA PAC N3000.
- IPv4 encapsulation ntawm PTP pob ntawv, vim kev txwv kev teeb tsa ntawm Cisco Nexus 93180YC-FX hloov.
- PTP cov lus pauv tus nqi txwv rau 8 pob ntawv / thib ob, vim muaj kev txwv kev teeb tsa ntawm Cisco Nexus 93180YC-FX hloov.
perf3 Traffic Test Result
Cov kev soj ntsuam hauv qab no ntes qhov kev ua tau zoo ntawm Intel FPGA PAC N3000 thiab XXV710 daim npav, ob qho tib si ib txhij ua raws li daim npav network ntawm PTP qhev (T-TSC) Calnex Paragon NEO Grandmaster los ntawm T-BC Cisco hloov.
Cov duab hauv qab no qhia txog qhov loj ntawm tus tswv offset thiab MPD nyob rau lub sijhawm rau peb qhov kev sib tw tsheb sib txawv siv Intel FPGA PAC N3000 nrog T-TC thiab XXV710 daim npav. Nyob rau hauv ob daim npav, kev khiav tsheb bidirectional muaj qhov cuam tshuam loj tshaj plaws ntawm PTP4l kev ua haujlwm. Lub sijhawm kuaj tsheb yog 10 teev ntev. Nyob rau hauv cov duab hauv qab no, daim duab tus Tsov tus tw taw tes rau lub sijhawm uas cov tsheb nres thiab qhov loj ntawm PTP tus tswv offset nqis mus rau nws qib qis, vim yog qhov tsis ua haujlwm.
Magnitude ntawm Master Offset rau Intel FPGA PAC N3000
Cov duab hauv qab no qhia tau hais tias txoj kev ncua sij hawm rau Intel FPGA PAC N3000 nrog T TC, nyob rau hauv ingress, egress thiab bidirectional iperf3 tsheb.
Mean Path Delay (MPD) rau Intel FPGA PAC N3000
Cov duab hauv qab no qhia tau hais tias txoj kev ncua sij hawm rau Intel FPGA PAC N3000 nrog T TC, nyob rau hauv ingress, egress thiab bidirectional iperf3 tsheb.
Magnitude ntawm Master Offset rau XXV710
Cov duab hauv qab no qhia qhov loj ntawm tus tswv offset rau XXV710, nyob rau hauv ingress, egress thiab bidirectional iperf3 tsheb.
Lub ntsiab lus ncua sij hawm (MPD) rau XXV710
Cov duab hauv qab no qhia tau hais tias txoj kev ncua sij hawm rau XXV710, nyob rau hauv ingress, egress thiab bidirectional iperf3 tsheb.
Hais txog Intel FPGA PAC N3000 PTP kev ua tau zoo, qhov phem tshaj plaws tus tswv offset nyob rau hauv ib qho xwm txheej yog nyob rau hauv 90 ns. Thaum nyob rau hauv tib txoj kev tsheb thauj mus los, RMS ntawm Intel FPGA PAC N3000 tus tswv offset yog 5.6x zoo dua li ib daim npav XXV710.
| Intel FPGA PAC N3000 | XXV 710 Card | |||||
| Ingress Traffic10g ua | Egress Traffic 18G | Bidirectional Traffic18g ua | Ingress Traffic18g ua | Egress Traffic 10G | Bidirectional Traffic18g ua | |
| RMS | 27.6 ib ns | 14.2 ib ns | 27.2 ib ns | 93.96 ib ns | 164.2 ib ns | 154.7 ib ns |
| StdDev (ntawm abs (max) offset) | 9.8 ib ns | 8.7 ib ns | 14.6 ib ns | 61.2 ib ns | 123.8 ib ns | 100 ib ns |
| StdDev (ntawm MPD) | 21.6 ib ns | 9.2 ib ns | 20.6 ib ns | 55.58 ib ns | 55.3 ib ns | 75.9 ib ns |
| Max offset | 84 ib ns | 62 ib ns | 90 ib ns | 474 ib ns | 1,106 ib ns | 958 ib ns |
Qhov tseem ceeb, tus tswv offset ntawm Intel FPGA PAC N3000 muaj qis tus qauv sib txawv,
tsawg kawg yog 5x tsawg dua daim npav XXV710, qhia tias PTP kwv yees ntawm
Grandmaster moos tsis tshua nkag siab rau latency lossis suab nrov variations nyob rau hauv lub tsheb khiav
Intel FPGA PAC N3000.
Thaum piv rau IXIA Traffic Test Result ntawm nplooj 5, qhov phem tshaj qhov loj ntawm
tus tswv offset nrog T-TC enabled Intel FPGA PAC N3000 zoo li ntau dua. Dhau li
qhov sib txawv hauv network topology thiab channel bandwidths, qhov no yog vim Intel
FPGA PAC N3000 raug ntes nyob rau hauv G.8275.1 PTP profile (16 Hz sync tus nqi), thaum
tus nqi sib txuas lus hauv qhov no yog txwv ntawm 8 pob ntawv ib ob.
Magnitude ntawm Master Offset Sib Piv
Cov duab hauv qab no qhia qhov loj ntawm tus tswv offset sib piv nyob rau hauv bidirectional iperf3 tsheb.
Kev sib piv Mean Path Delay (MPD)
Cov duab hauv qab no qhia tau hais tias txoj kev ncua sij hawm sib piv nyob rau hauv bidirectional iperf3 tsheb.
Qhov kev ua tau zoo tshaj PTP ntawm Intel FPGA PAC N3000, thaum piv rau XXV710 daim npav, kuj tau txais kev txhawb nqa los ntawm qhov pom tseeb dua qhov sib txawv ntawm kev suav txoj kev ncua sij hawm (MPD) rau XXV710 thiab Intel FPGA PAC N3000 hauv txhua qhov kev ntsuas tsheb, rau example bidirectional iperf3 tsheb. Tsis quav ntsej tus nqi nruab nrab hauv txhua rooj plaub MPD, uas tuaj yeem sib txawv vim muaj ntau qhov laj thawj, xws li Ethernet cables sib txawv thiab cov latency sib txawv. Qhov pom qhov tsis sib xws thiab qhov tseem ceeb ntawm daim npav XXV710 tsis muaj nyob hauv Intel FPGA PAC N3000.
RMS ntawm 8 Sib Nqus Master Offset Sib Piv
Xaus
FPGA cov ntaub ntawv txoj kev ntawm QSFP28 (25G MAC) thiab Intel XL710 (40G MAC) ntxiv cov pob ntawv sib txawv uas cuam tshuam rau qhov kwv yees qhov tseeb ntawm PTP Slave. Ntxiv Lub Sijhawm Pob tshab (T-TC) kev txhawb nqa hauv FPGA soft logic ntawm Intel FPGA PAC N3000 muab kev them nyiaj ntawm cov pob ntawv latency no los ntawm kev ntxiv nws lub sijhawm nyob hauv kev kho qhov chaw ntawm encapsulated PTP cov lus. Cov txiaj ntsig tau lees paub tias T-TC mechanism txhim kho qhov tseeb ntawm PTP4l qhev.
Tsis tas li ntawd, IXIA Traffic Test Result ntawm nplooj 5 qhia tias T-TC kev txhawb nqa hauv FPGA cov ntaub ntawv txoj kev txhim kho PTP kev ua tau zoo los ntawm tsawg kawg yog 4x, thaum piv rau Intel FPGA PAC N3000 yam tsis muaj T-TC kev txhawb nqa. Intel FPGA PAC N3000 nrog T-TC nthuav tawm qhov phem tshaj tus tswv offset ntawm 53 ns nyob rau hauv ingress, egress los yog bidirectional tsheb thauj khoom ntawm qhov txwv ntawm channel muaj peev xwm (25 Gbps). Li no, nrog T-TC kev txhawb nqa, Intel FPGA PAC N3000 PTP kev ua tau zoo yog qhov tseeb dua thiab tsis tshua muaj suab nrov.
Hauv lperf3 Traffic Test ntawm nplooj 10, PTP kev ua tau zoo ntawm Intel FPGA PAC N3000 nrog T-TC enabled yog muab piv rau XXV710 daim npav. Qhov kev sim no tau ntes cov ntaub ntawv PTP4l rau ob lub moos qhev nyob rau hauv ingress lossis egress tsheb uas tau pauv ntawm ob lub tswv yim ntawm Intel FPGA PAC N3000 thiab XXV710 daim npav. Qhov phem tshaj tus tswv offset pom hauv Intel FPGA PAC N3000 yog tsawg kawg 5x qis dua daim npav XXV710. Tsis tas li ntawd, tus qauv sib txawv ntawm kev ntes cov offsets kuj ua pov thawj tias T-TC kev txhawb nqa ntawm Intel FPGA PAC N3000 tso cai rau smoother approximation ntawm Grandmaster lub moos.
Txhawm rau ua kom muaj txiaj ntsig ntxiv rau PTP kev ua tau zoo ntawm Intel FPGA PAC N3000, cov kev xaiv xeem muaj xws li:
- Validation nyob rau hauv txawv PTP profiles thiab cov nqi lus rau ntau tshaj ib qho Ethernet txuas.
- Kev ntsuam xyuas ntawm lperf3 Traffic Test ntawm nplooj 10 nrog rau kev hloov siab dua uas tso cai rau PTP cov lus ntau dua.
- Kev ntsuam xyuas ntawm T-SC kev ua haujlwm thiab nws cov sijhawm ua haujlwm PTP raug raws li G.8273.2 Kev Ntsuas Kev Ntsuas.
Cov ntaub ntawv kho dua tshiab rau IEEE 1588 V2 Test
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