Date: Tue, 20 Oct 2020 10:26:57 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 248652] iflib: netmap pkt-gen large TX performance difference between 11-STABLE and 12-STABLE/CURRENT on ix & ixl NIC Message-ID: <bug-248652-7501-Wzmekb83Py@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-248652-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-248652-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248652 --- Comment #26 from Sylvain Galliano <sg@efficientip.com> --- (In reply to Vincenzo Maffione from comment #25) you are correct, using 1 queue on both ix/ixl NIC + tuning new sysctl, we h= ave same result as FreeBSD 11 Regarding avg_batch values on ixl, they are very low, not in the range you expected: 6 queues, iflib.nm_tx_tmr_us=3D5 070.664142 main_thread [2639] 13.588 Mpps (13.602 Mpkts 6.522 Gbps in 10010= 00 usec) 20.87 avg_batch 99999 min_space cpu usage: 100% even with 1 queue I got a low value for avg_batch: 283.855379 main_thread [2639] 12.147 Mpps (12.757 Mpkts 5.831 Gbps in 10502= 45 usec) 13.97 avg_batch 99999 min_space cpu usage: 100% ix (X520) NIC have a good avg_batch (whatever the number of queue): 404.130120 main_thread [2639] 14.880 Mpps (14.895 Mpkts 7.143 Gbps in 10009= 99 usec) 436.04 avg_batch 99999 min_space I don't known if this can help you but I did another test specific to ixl N= IC: setting hw.ixl.enable_head_writeback=3D0 avg_batch is higher, pps a little better and we are not CPU bound this time: 6 queues: 603.651106 main_thread [2639] 17.384 Mpps (17.402 Mpkts 8.345 Gbps in 10010= 03 usec) 308.10 avg_batch 99999 min_space cpu usage: 71% 1 queue: 730.590104 main_thread [2639] 15.084 Mpps (15.416 Mpkts 7.241 Gbps in 10220= 04 usec) 442.64 avg_batch 99999 min_space cpu usage: 57% Same test but using more threads on pkt-gen (-p 6), 6 queues: 995.887010 main_thread [2639] 17.327 Mpps (17.339 Mpkts 8.317 Gbps in 10006= 93 usec) 286.35 avg_batch 599994 min_space cpu usage: 197% top -H: PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 70876 root -92 0 348M 16M select 3 0:23 35.46% pkt-gen{pkt-gen} 70876 root -92 0 348M 16M CPU4 4 0:23 33.58% pkt-gen{pkt-gen} 70876 root -92 0 348M 16M RUN 6 0:23 33.44% pkt-gen{pkt-gen} 70876 root -92 0 348M 16M select 2 0:23 31.69% pkt-gen{pkt-gen} 70876 root 45 0 348M 16M CPU9 9 0:23 31.64% pkt-gen{pkt-gen} 70876 root -92 0 348M 16M select 6 0:23 31.24% pkt-gen{pkt-gen} --=20 You are receiving this mail because: You are on the CC list for the bug.=
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