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Date: Thu, 09 Apr 2009 09:56:01 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Ivan Voras <ivoras@freebsd.org>
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Cc: freebsd-stable@freebsd.org
Subject: Re: ZFSKnownProblems - needs revision? / Lighttpd
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Ivan Voras wrote:
> 2009/4/8 Miroslav Lachman <000.fbsd@quip.cz>:
> 
>>(Lighttpd problem may be related to jail instead of ZFS - I did not test it
>>yet)
> 
> Completely unrelated to ZFS, but wasn't there some issue with lighttpd
> and sendfile() relatively recently (sendfile is the default)? Have you
> tried   server.network-backend = "writev" ?

I know about the problem with sendfile as I was hit by it on the main 
server with Lighttpd + UFS. It has different behavior and it was fixed 
in the latest version of Lighttpd from ports. Both servers (main with 
UFS and second with ZFS + Jail) are running this fixed version.

I will test it with "writev", thanks for suggestion.

With lower load, Lighttpd is shown in `top` with state 'kqread', but 
with higher load in the case of slowdown, the state is 'zfs->io'.

Miroslav Lachman