3c59x: recurring transmit errors

[Dan Stromberg]

Ravi Swamy wrote:
> On Tue, 28 Jul 1998, Dan Stromberg wrote:
> > In my case, using an 8k rsize and wsize makes a VERY LARGE difference -
> > it yields a very nice performance improvement.
> 
> Even with 8k rsize,wsize I only get around 300kB/s.  This is on a PPro 200 w/
> a 3c905 on a 100Mb hub.  There is very little traffic on the hub, I can
> run the test at 1am and see very little difference.

I agree that it's still slower than other unixes, but as I said, in my
case, using 8k rsize and wsize gives a quite large increase in
performance.

I wish I'd saved my benchmarks the first or second time I did them.  I
don't have time to do them again.

> I just don't see it helping much.  It does seem to speed things up by
> maybe 25% but I need a 10X  increase.  My 300KB/s should be 3MB/s.

I'm thinking it was around 2 or 3x.  Not as much as you could hope for,
but still worthwhile.

> I've never seen it explained.  I always hear people say "change the rsize/wsize"but it is just a small improvement.  I can ftp files to and from Linux<->Solaris
> and get almost 8MB/s but NFS writes crawl...

It's no small improvement in my case.  On the cards I've tried (tulip,
wd8013), it really helped a lot.  Maybe it depends on the driver.