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Date: Mon, 24 Sep 2012 16:38:46 -0400 (EDT) From: David Miller <davem@...emloft.net> To: eric.dumazet@...il.com Cc: netdev@...r.kernel.org Subject: Re: [PATCH net-net] net: loopback: set default mtu to 64K From: Eric Dumazet <eric.dumazet@...il.com> Date: Mon, 24 Sep 2012 22:33:16 +0200 > On Mon, 2012-09-24 at 16:24 -0400, David Miller wrote: >> From: Eric Dumazet <eric.dumazet@...il.com> >> Date: Mon, 24 Sep 2012 10:28:59 +0200 >> >> > From: Eric Dumazet <edumazet@...gle.com> >> > >> > loopback current mtu of 16436 bytes allows no more than 3 MSS TCP >> > segments per frame, or 48 Kbytes. Changing mtu to 64K allows TCP >> > stack to build large frames and significantly reduces stack overhead. >> > >> > Performance boost on bulk TCP transferts can be up to 30 %, partly >> > because we now have one ACK message for two 64KB segments, and a lower >> > probability of hitting /proc/sys/net/ipv4/tcp_reordering default limit. >> > >> > Signed-off-by: Eric Dumazet <edumazet@...gle.com> >> >> This gives a nice %13 improvement on my SPARC-T4 box as well. >> >> Applied, thanks Eric. > > the biggest increase is with > > netperf -- -m 63K > > I reach 50000 Mbytes/second I tested with lmbench bw_tcp, which gives me about 1308 MB/sec. And indeed that netperf command line gives superior numbers, about 11747 MB/sec -- 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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