8.2-RELEASE and stable/8 have the same problem. Ping RTT triples when MSIX is disabled.
On 10/3/2011 11:50 AM, Jack Vogel wrote:
Can you try the driver in 8.2 and possibly stable/8 to see the behavior there. And, just curious, why are you disabling MSIX? Jack On Mon, Oct 3, 2011 at 12:51 AM, Hooman Fazaeli <[email protected] <mailto:[email protected]>> wrote: Hi Jack The hardware is a PCIe network appliance with 3 port modules. The ports I have used in the test are 82574L residing on a 4 port module. Anyway, as I noted in last mail, the stock 7.3-RELEASE driver does not expose this problem on the same hardware. On 10/2/2011 7:38 PM, Jack Vogel wrote:On what hardware? Jack On Sun, Oct 2, 2011 at 6:42 AM, Hooman Fazaeli <[email protected] <mailto:[email protected]>> 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 <http://192.168.1.83>: icmp_seq=0 ttl=64 time=0.055 ms 64 bytes from 192.168.1.83 <http://192.168.1.83>: icmp_seq=1 ttl=64 time=0.076 ms 64 bytes from 192.168.1.83 <http://192.168.1.83>: icmp_seq=2 ttl=64 time=0.066 ms 64 bytes from 192.168.1.83 <http://192.168.1.83>: icmp_seq=3 ttl=64 time=0.051 ms 64 bytes from 192.168.1.83 <http://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 <http://192.168.1.83>: icmp_seq=0 ttl=64 time=0.180 ms 64 bytes from 192.168.1.83 <http://192.168.1.83>: icmp_seq=1 ttl=64 time=0.164 ms 64 bytes from 192.168.1.83 <http://192.168.1.83>: icmp_seq=2 ttl=64 time=0.169 ms 64 bytes from 192.168.1.83 <http://192.168.1.83>: icmp_seq=3 ttl=64 time=0.172 ms 64 bytes from 192.168.1.83 <http://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?
_______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[email protected]"
