Date: Fri, 13 Feb 2009 20:01:21 +0000 From: ivoras@gmail.com To: Josh Paetzel <josh@tcbug.org>, Ivan Voras <ivoras@freebsd.org>, Antony Mawer <fbsd-performance@mawer.org>, freebsd-performance@freebsd.org Subject: Re: Re: FreeBSD 7.1 disk performance issue on ESXi 3.5 Message-ID: <000e0cd28750065bb80462d24d55@google.com> In-Reply-To: <666B517C-6E30-465D-8BAD-B6266C4D3743@tcbug.org>
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On Feb 13, 2009 8:27pm, Josh Paetzel <josh@tcbug.org> wrote: > In my limited experience with VMWare linux seems to have near bare metal disk performance. FreeBSD seems to incur a significant performance penalty. For instance on my laptop, running OSX and VMWare Fusion, FreeBSd virtual machines can't saturate 100TX off the disk, raw dd manages about 7 Megs/sec, which is in line with what I get shovelling big files around. Disk is a 7200 RPM SATA2. > You might want to try the patch Scott Long made recently (http://svn.freebsd.org/changeset/base/188570) - I found it doubles the performance in some cases for VMWare (writing mostly, though sequential reading can be similarly improved by the combination of this patch and increasing vfs.read_max), but it's still worse than with Linux (100 MB/s vs 150 MB/s). As for the original thread topic: I've communicated with the OP and it appears his method of benchmarking had an error so the problems that appear in his post are bogus.
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