Date: Fri, 28 Aug 2020 19:58:15 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 248652] netmap: pkt-gen TX huge pps difference between 11-STABLE and 12-STABLE/CURRENT on ix & ixl NIC Message-ID: <bug-248652-7501-7DKWopxcpl@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 #8 from Sylvain Galliano <sg@efficientip.com> --- After looking at iflib_netmap_timer_adjust() & iflib_netmap_txsync() in sys/net/iflib.c, I made some tuning on kern.hz: Still using X520 with 1 queue ix0: PCI Express Bus: Speed 5.0GT/s Width x8 ix0: netmap queues/slots: TX 1/2048, RX 1/2048 ***************** /boot/loader.conf: kern.hz=3D1000 (default) pkt-gen result: 204.153802 main_thread [2639] 2.562 Mpps (2.567 Mpkts 1.230 Gbps in 1001994 usec) 465.32 avg_batch 99999 min_space 205.155321 main_thread [2639] 2.561 Mpps (2.565 Mpkts 1.229 Gbps in 1001519 usec) 465.45 avg_batch 99999 min_space 5500 irq/s: ***************** /boot/loader.conf: kern.hz=3D1999 pkt-gen result: 41.375049 main_thread [2639] 5.117 Mpps (5.222 Mpkts 2.456 Gbps in 1020510 usec) 465.45 avg_batch 99999 min_space 42.375546 main_thread [2639] 5.118 Mpps (5.121 Mpkts 2.457 Gbps in 1000497 usec) 465.42 avg_batch 99999 min_space 11000 irq/s X2 performance & irq/s ***************** /boot/loader.conf: kern.hz=3D2000 pkt-gen result: 797.608080 main_thread [2639] 2.560 Mpps (2.563 Mpkts 1.229 Gbps in 1001001 usec) 465.50 avg_batch 99999 min_space 798.609079 main_thread [2639] 2.560 Mpps (2.563 Mpkts 1.229 Gbps in 1000999 usec) 465.41 avg_batch 99999 min_space 5500 irq/s Same performance & irq/s as kern.hz=3D1000 (due to limit at 2000 in iflib_netmap_timer_adjust & iflib_netmap_txsync) ***************** Last test, this one I forced 'ticks' parameter to '1' in callout_reset_on on iflib_netmap_timer_adjust & iflib_netmap_txsync by increasing the 2000 limit to 20000 in both functions and put an insame value for kern.hz /boot/loader.conf: kern.hz=3D10000 pkt-gen result: 345.415939 main_thread [2639] 14.880 Mpps (14.890 Mpkts 7.142 Gbps in 10006= 99 usec) 430.97 avg_batch 99999 min_space 346.429134 main_thread [2639] 14.880 Mpps (15.076 Mpkts 7.142 Gbps in 10131= 96 usec) 432.17 avg_batch 99999 min_space 29000 irq/s Same performance as FreeBSD 11 Looks like callout_reset_on to iflib_timer have a look high delay. --=20 You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug.=
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