Re: [RESEND] tuning linux for high network performance?

On Wed, Oct 23, 2002 at 01:06:18PM +0200, Roy Sigurd Karlsbakk wrote:

quoted

I've got this video server serving video for VoD. problem is the P4 1.8
seems to be maxed out by a few system calls. The below output is for ~50
clients streaming at ~4.5Mbps. if trying to increase this to ~70, the CPU
maxes out.

'50 clients *each* streaming at ~4.4MBps', better make that clear, otherwise
something is *very* broken. Also mention that you have an e1000 card which
does not do outgoing checksumming.

You'd think that a kernel would be able to do 250megabits of TCP checksums
though.

...adding the whole profile output - sorted by the first column this time...

905182 total                                      0.4741
121426 csum_partial_copy_generic                474.3203
 93633 default_idle                             1800.6346
 74665 do_wp_page                               111.1086

Perhaps the 'copy' also entails grabbing the page from disk, leading to
inflated csum_partial_copy_generic stats?

Where are you serving from?

Regards,

bert

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