From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: bad TSO performance in 2.6.9-rc2-BK Date: Fri, 1 Oct 2004 12:35:54 +0200 Sender: netdev-bounce@oss.sgi.com Message-ID: <20041001103554.GB4898@wotan.suse.de> References: <20040929162923.796d142e.davem@davemloft.net> <20040929170310.46c58095.davem@davemloft.net> <20040930001007.GB10496@gondor.apana.org.au> <20040930173439.3e0d2799.davem@davemloft.net> <20040930181248.48185e41.davem@davemloft.net> <20040930204005.69115c0e.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: herbert@gondor.apana.org.au, jheffner@psc.edu, ak@suse.de, niv@us.ibm.com, andy.grover@gmail.com, anton@samba.org, netdev@oss.sgi.com Return-path: To: "David S. Miller" Content-Disposition: inline In-Reply-To: <20040930204005.69115c0e.davem@davemloft.net> Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org > How do things look for you with this change Andi? > If things are still out of whack, play around with > different values of /proc/sys/net/ipv4/tcp_tso_win_divisor Still slower, like previously reported. But I tried tweaking the sysctl now. Result is that 2 is pretty good (only 3MB/s) slower and >20 is also pretty good (2MB/s slower). Everything inbetween is a lot slower, varying a bit. I wasn't able to find a setting that gave the same results as TSO off though, although the difference is not that dramatic anymore. -Andi