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Date: Wed, 30 Jan 2008 20:16:33 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Ivan Voras <ivoras@freebsd.org>
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Cc: freebsd-performance@freebsd.org
Subject: Re: postgresql-performance using sysbench
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Ivan Voras wrote:
> Kris Kennaway wrote:
> 
>> Write performance is something that we are working on, expect to hear
>> about progress over the coming weeks/months.
> 
> Do you have some notes or descriptions about what is being worked on?
> I'm currently doing some file system benchmarking for internal purposes
> and I'm seeing sequential read/write performance nontrivially lower on
> FreeBSD+UFS than on Linux+ext3. The Linux combination has ~~20% faster
> writes and ~~60% faster reads, on a hardware RAID10 of four 15kRPM
> drives, IBM ServeRAID 8 (file system ops / nonsequential are worse -
> send me a private message for details). Is the work that's been going on
> about lock contention or something at the low levels of the file system?
> 

Rewrite of the lockmgr primitive, for starters.  Then we'll see what 
remains.

Kris