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.....
tcp_window_scaling:1
is already set at 1. What else do we need to change to get the
advertized window size to go up?
Roger.
----------------------------------------------------------
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
volatile int count;
void alrm (int sig)
{
static int oldcount=0;
if (sig) {
printf ("%d\n", count-oldcount);
oldcount = count;
}
signal (SIGALRM, alrm);
alarm (1);
}
int main (int argc, char **argv)
{
alrm (0);
while (1)
count ++;
}
--
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
* There are old pilots, and there are bold pilots.
* There are also old, bald pilots.
-
: 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
