On Jul 6, 2014, at 17:39 , Matthias Scheler <t...@zhadum.org.uk> wrote: > On Fri, Jul 04, 2014 at 02:43:19PM +0000, Emmanuel Dreyfus wrote: >> I quote myself here: >> >> On Wed, Jul 02, 2014 at 02:05:53PM +0000, Emmanuel Dreyfus wrote: >>> TCP connection established. >>> Packet size 1k bytes: 114938 KByte/s Tx, 114816 KByte/s Rx. >>> Packet size 2k bytes: 114924 KByte/s Tx, 114868 KByte/s Rx. >>> Packet size 4k bytes: 114871 KByte/s Tx, 114901 KByte/s Rx. >>> Packet size 8k bytes: 114877 KByte/s Tx, 114900 KByte/s Rx. >>> Packet size 16k bytes: 114882 KByte/s Tx, 114914 KByte/s Rx. >>> Packet size 32k bytes: 114881 KByte/s Tx, 114905 KByte/s Rx. >> >> ioperf reports awful perfs. But netperf says: >> >> root@saccharose# netperf -H 10.103.101.117 >> TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.103.101.117 >> (10.103.101.117) port 0 AF_INET >> Recv Send Send >> Socket Socket Message Elapsed >> Size Size Size Time Throughput >> bytes bytes bytes secs. 10^6bits/sec >> >> 32768 32768 32768 10.01 1152.76 >> >> This look much better: maximum bandwith is 1200 Mb/s as I understand. >> >> How can this be explained? > > Probably by a various factors: > 1.) Lack of SMP scalabity in the network stack. > 2.) No MSIE-X support. > 3.) No RSS support in the driver. > > You will also struggle to sature a 10Gb/s link with a single TCP connection > in general.
Actually, it used to be ok performance, but after NetBSD 2.x - 3 (somewhere) release the performance went down. http://bsd-beta.slashdot.org/story/04/05/03/2235255/netbsd-sets-internet2-land-speed-world-record (I think the old Dell 2650 with the iNTEL 10 GB/s cards are still somewhere in the basement of LTU…) /P
