Date: Tue, 12 Oct 2010 03:07:09 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-fs@freebsd.org Subject: Re: Locked up processes after upgrade to ZFS v15 Message-ID: <20101012100709.GA29861@icarus.home.lan> In-Reply-To: <4CB3870F.7070107@icyb.net.ua> References: <39F05641-4E46-4BE0-81CA-4DEB175A5FBE@free.de> <20101009111241.GA58948@icarus.home.lan> <CF901B53-657E-49FC-A43B-27BC7D49F7A7@free.de> <4CB17983.3020907@icyb.net.ua> <20101011151508.GA10917@icarus.home.lan> <4CB32C75.2060000@icyb.net.ua> <20101011183707.GA13925@icarus.home.lan> <4CB3870F.7070107@icyb.net.ua>
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On Tue, Oct 12, 2010 at 12:52:15AM +0300, Andriy Gapon wrote: > on 11/10/2010 21:37 Jeremy Chadwick said the following: > > EnableMMAP on > > EnableSendfile on > > Yes, it is it. > > Jeremy, Kai, > could you please try to test this patch? > http://people.freebsd.org/~avg/zfs-mappedread-sendfile.diff > > Kostik, > could you please review it? Andriy, I've been trying to reproduce this problem on my testbed box without much luck so far. The box differs severely -- the biggest differences being the testbed runs i386 (due to CPU), only has 1GB RAM, and is single-core. I don't have an amd64 testbed system on hand right now. I've been trying to reproduce it by enabling Sendfile and MMAP in Apache on the system, putting up some very large files on an Apache-accessible ZFS filesystem, and using something like "wget -r" to download everything. I've been watching "netstat -m" to monitor the number of sendfile requests. There have been a couple cases where I've seen processes go into "zfs" state, but I have yet to see any lock up. Is there something amd64-specific to the problem at hand, or maybe some VM feature which isn't getting triggered on i386? Or do you know of a reliable way to reproduce the issue at this point? -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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