Date: Tue, 21 Nov 2006 23:12:38 +0000 From: Dieter <freebsd@sopwith.solgatos.com> To: freebsd-questions@freebsd.org Subject: processes not getting fair share of available disk I/O (was: Re: TCP parameters and interpreting tcpdump output ) Message-ID: <200611220712.HAA18428@sopwith.solgatos.com> In-Reply-To: Your message of "Mon, 20 Nov 2006 11:19:52 EST." <20061120111952.4213dacb.wmoran@collaborativefusion.com>
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> I'm surprised that you're seeing that much of a "hang". Even if the disks > are busy, the system should slow down all disk processes equally, so no > one process "blocks", but they're all a little slower. I collected a bit of data: While copying a large file from disk1 to disk2, time ls on a small directory on disk3 (not cached in memory) real 0m0.032s user 0m0.000s sys 0m0.003s time ls on a small directory on disk2 real 4m51.911s user 0m0.000s sys 0m0.002s I expect access to a busy disk to take longer, but 5 minutes is a bit much. And that's the root directory of the filesystem, it didn't have to follow a long chain of directories to get there. Sometimes I see long delays when accessing disk3, but it is behaving at the moment.
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