'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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