RE: AW: Re: [PATCH] S4bios for 2.5.52.

[Nigel Cunningham <ncunningham-oKK1aGe2n869koe0gwxAeg@public.gmane.org>]

Hmm. I didn't think that carefully about what was causing the write to
occur. Hence I unrolled I took your patch further and completely separated
the submitting of _all_ of the pages from the block_flushpage calls for all
of the pages (ie two loops). (I saw much more than a one second gain, even
on my faster desktop computer!) After reading this, I think I should look
sooner at what is going. I was going to anyway, but I was concentrating on
getting my whole port from 2.4 working first.

I'm not promising anything quickly - I have plenty of 'real' work at the
moment :>

Regards,

Nigel

> Still, writing pages synchronously, one at a time, is going
> to be slow no
> matter what you do.  *Especially* on slow laptop drives.
>
> What I sent Nigel was a little patch to write them 20 at a
> time, which reduced
> my suspend times from nearly 60 seconds to something around 2
> seconds.  I
> stopped at 20 because going beyond that was chasing
> diminishing returns and I
> didn't think that chewing up a huge chunk of stack was
> justified for a
> one-second reduction in suspend times.
>
> I didn't send it on to the rest of the list because I figure
> Nigel's other
> changes will be coming along as well, and I didn't want to
> make merging too
> difficult for everyone.



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