On Mon, Jul 22, 2002 at 04:34:30PM +0200, Rogier Wolff wrote: > > Hi, > > I'm trying to get some performance out of some gigabit ethernet > cards. Tweaking here and there we're now up to over 50 mbyte per > second. > > However, I think there is "more to be had": we're not close to the > wire speed, and both machines still have CPU free. (not only measured > through top and friends, but also measured with a concurrently running > "bogomips counter" (Attached below).) > > > The important settings we've changed to get to this point are: > > tcp_mem:1048576 1048576 1048576 > tcp_rmem:131072 131072 131072 > tcp_wmem:131072 131072 131072 > > and the MTU for the link to 6000 (that's max for one of the cards that > we have) > > but I still see only 32k of advertized "window". And at those speeds, > the window can easily be "too small". We would therefore like the window > to be advertized a bit larger..... Never having done this before, my best guess would be to change the following line in the kernel source and recompile: include/net/tcp.h:#define MAX_TCP_WINDOW 32767U You've got the scaling going, but of source it's scaling right up to your maximum window size. Chris - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
