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Re: zero-filed page on VOP_PUTPAGES
> Emmanuel Dreyfus <manu%netbsd.org@localhost> wrote:
>> > i found the following patch in my tree.
>> > unfortunately i forgot details and if there were more cases which needs
>> > similar barriers.
>> This fixes the problem with no detectable performance hit. Is there
>> any reason why it should not be committed?
i forgot. :-)
> Extensive testing shows that the same kind of bug exists if puffs_init()
> is called without PUFFS_KFLAG_WTCACHE. This happens on netbsd-5 with and
> without your patch.
> The difference is that the chunk of zero spans multiple pages (but its
> length is not page-aligned) and is always located at offset 0. Example
> of output from my test case ( size of zero-filled chunk @ offset )
> 21071 @ 0
> 9145 @ 0
> 26493 @ 0
> 20772 @ 0
have you tried to analyze the problem with PUFFS_FLAG_OPDUMP?
does your server process requests from kernel simultaneously?
> Emmanuel Dreyfus
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