On Wednesday 23 October 2002 16:59, Nivedita Singhvi wrote:
> bert hubert wrote:
> > > ...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?
>
> I think this is strictly a copy from user space->kernel and vice versa.
> This shouldnt include the disk access etc.
hm
I'm doing O_DIRECT read (from disk), so it needs to be user -> kernel, then.
any chance of using O_DIRECT to the socket?
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