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Date: Tue, 09 Nov 2010 14:59:19 +0100 From: Jesper Dangaard Brouer <jdb@...x.dk> To: Eric Dumazet <eric.dumazet@...il.com> Cc: netdev <netdev@...r.kernel.org> Subject: Re: Loopback performance from kernel 2.6.12 to 2.6.37 On Mon, 2010-11-08 at 16:06 +0100, Eric Dumazet wrote: ... > > > > > I noticed that the loopback performance has gotten quite bad: > > > > > > > > > > http://www.phoronix.com/scan.php?page=article&item=linux_2612_2637&num=6 > > > CC netdev, if you dont mind. No problem :-) > Their network test is basically : > > netcat -l 9999 >/dev/null & > time dd if=/dev/zero bs=1M count=10000 | netcat 127.0.0.1 9999 Should it not be: netcat -l -p 9999 >/dev/null & When I run the commands "dd | netcat", netcat never finish/exits, I have to press Ctrl-C to stop it. What am I doing wrong? Any tricks? "dd" reports 17.54 sec, and but the "time" measurement cannot be uses as the netcat just hangs/waits for more data... time dd if=/dev/zero bs=1M count=10000 | netcat 127.0.0.1 9999 10000+0 records in 10000+0 records out 10485760000 bytes (10 GB) copied, 17,5419 s, 598 MB/s When I run the commands, I see 261682 context switches per sec... This quick test were on a Core i7 920 using kernel 2.6.32-rc3-net-next-dev-mp2t. -- Jesper Dangaard Brouer ComX Networks A/S -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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