Re: [PATCH] /dev/zero page fault scaling

[Hugh Dickins <hugh@veritas.com>]

On Wed, 14 Jul 2004, Brent Casavant wrote:
> 
> In a test program to measure the page fault performance, at 256P we
> see a 150x improvement in the number of page faults per cpu per
> wall-clock second (and other similar measures).  Page fault performance
> drops by about 50% at 512P compared to 256P, however this is likely
> a seperate problem (investigation has not started), but is still
> 138x better than before these changes.

Wow.  Good work.

> I'm not sure if this list is the appropriate place to submit these
> changes.  If not, please direct me to the correct lists/people to
> submit this to.  The patch is against 2.6.(something recent, maybe 7).

This list'll do fine.  I'm the (unlisted) tmpfs maintainer, I'll give
your patch a go tomorrow, and try to convert it to NULL sbinfo as I
mentioned.  I'll send you back the result, but won't send it on to
Andrew thence Linus for a couple of weeks, until after the Ottawa
Linux Symposium.

Thanks a lot!
Hugh

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