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Message-ID: <20071002101055.219753cd@freepuppy.rosehill> Date: Tue, 2 Oct 2007 10:10:55 -0700 From: Stephen Hemminger <shemminger@...ux-foundation.org> To: lm@...mover.com (Larry McVoy) Cc: Larry McVoy <lm@...mover.com>, Herbert Xu <herbert@...dor.apana.org.au>, torvalds@...ux-foundation.org, davem@...emloft.net, wscott@...mover.com, netdev@...r.kernel.org Subject: Re: tcp bw in 2.6 On Tue, 2 Oct 2007 09:49:52 -0700 lm@...mover.com (Larry McVoy) wrote: > On Tue, Oct 02, 2007 at 09:47:26AM -0700, Stephen Hemminger wrote: > > On Tue, 2 Oct 2007 09:25:34 -0700 > > lm@...mover.com (Larry McVoy) wrote: > > > > > > If the server side is the source of the data, i.e, it's transfer is a > > > > write loop, then I get the bad behaviour. > > > > ... > > > > So is this a bug or intentional? > > > > > > For whatever it is worth, I believed that we used to get better performance > > > from the same hardware. My guess is that it changed somewhere between > > > 2.6.15-1-k7 and 2.6.18-5-k7. > > > > For the period from 2.6.15 to 2.6.18, the kernel by default enabled TCP > > Appropriate Byte Counting. This caused bad performance on applications that > > did small writes. > > It's doing 1MB writes. > > Is there a sockopt to turn that off? Or /proc or something? sysctl -w net.ipv4.tcp_abc=0 -- Stephen Hemminger <shemminger@...ux-foundation.org> - 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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