Hi, On Sun, Oct 2, 2011 at 12:08 PM, Jack Vogel <jfvo...@gmail.com> wrote: > On what hardware? > Only the 82574 is using em(4)'s MSI-X.
- Arnaud > Jack > > > On Sun, Oct 2, 2011 at 6:42 AM, Hooman Fazaeli <faza...@sepehrs.com> wrote: > >> >> Latest em(4) driver from HEAD seems to have high latency >> when MSIX is disabled. >> >> With MSIX enabled (hw.em.enable_msix=1): >> >> # ping -c5 192.168.1.83 >> PING 192.168.1.83 (192.168.1.83): 56 data bytes >> 64 bytes from 192.168.1.83: icmp_seq=0 ttl=64 time=0.055 ms >> 64 bytes from 192.168.1.83: icmp_seq=1 ttl=64 time=0.076 ms >> 64 bytes from 192.168.1.83: icmp_seq=2 ttl=64 time=0.066 ms >> 64 bytes from 192.168.1.83: icmp_seq=3 ttl=64 time=0.051 ms >> 64 bytes from 192.168.1.83: icmp_seq=4 ttl=64 time=0.063 ms >> >> --- 192.168.1.83 ping statistics --- >> 5 packets transmitted, 5 packets received, 0.0% packet loss >> round-trip min/avg/max/stddev = 0.051/0.062/0.076/0.009 ms >> >> With MSIX disabled: >> >> # ping -c5 192.168.1.83 >> PING 192.168.1.83 (192.168.1.83): 56 data bytes >> 64 bytes from 192.168.1.83: icmp_seq=0 ttl=64 time=0.180 ms >> 64 bytes from 192.168.1.83: icmp_seq=1 ttl=64 time=0.164 ms >> 64 bytes from 192.168.1.83: icmp_seq=2 ttl=64 time=0.169 ms >> 64 bytes from 192.168.1.83: icmp_seq=3 ttl=64 time=0.172 ms >> 64 bytes from 192.168.1.83: icmp_seq=4 ttl=64 time=0.167 ms >> >> --- 192.168.1.83 ping statistics --- >> 5 packets transmitted, 5 packets received, 0.0% packet loss >> round-trip min/avg/max/stddev = 0.164/0.170/0.180/0.005 ms >> >> As you see, w/o MSIX, RTT increases by a factor of 3. >> >> I also tested the following drivers: >> - igb(4) from HEAD: OK. >> - Stock 7.3-RELEASE: OK. >> - Stock 7.4-RELEASE: problem exist. >> >> Any ideas? >> >> >> >> >> > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" > _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
