Re: Poor gige performance with 2.4.20-pre*

On Sun, Sep 29, 2002 at 12:34:02AM -0600, Richard Gooch wrote:

This is all on a LAN (of course; expecting good performance from a WAN
is pretty futile). I use a buffer size of 256 KiB.

From my experience tuning on a 550MHz P3 Xeon, you're better off using a 

buffer size of 8-16KB that stays in the L1 cache.  Of course, that was 
without actually doing anything useful with the data being transferred.  
Gige really does need a faster cpu in the ghz+ range.  As for ns83820, 
it's a work in progress.  Some of the recent bugfixes may have reduced 
performance, so it may need to be retuned.

		-ben
-- 
GMS rules.

Benjamin LaHaise writes:

On Sun, Sep 29, 2002 at 12:34:02AM -0600, Richard Gooch wrote:

quoted

This is all on a LAN (of course; expecting good performance from a WAN
is pretty futile). I use a buffer size of 256 KiB.

From my experience tuning on a 550MHz P3 Xeon, you're better off
using a buffer size of 8-16KB that stays in the L1 cache.  Of
course, that was without actually doing anything useful with the
data being transferred.  Gige really does need a faster cpu in the
ghz+ range.  As for ns83820, it's a work in progress.  Some of the
recent bugfixes may have reduced performance, so it may need to be
retuned.

Using 8 KiB buffer reduces performance, 16 KiB is almost the same as
using 256 KiB.

				Regards,

					Richard....
Permanent: rgooch@atnf.csiro.au
Current:   rgooch@ras.ucalgary.ca