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Date: Mon, 30 Aug 2010 05:25:29 +0200
From: Alexander Leidinger <Alexander@Leidinger.net>
To: Artem Belevich <fbsdlist@src.cx>
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Cc: freebsd-current@freebsd.org, Martin Matuska <mm@freebsd.org>
Subject: Re: [CFT] Improved ZFS metaslab code (faster write speed)
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On Fri, 27 Aug 2010 20:34:18 -0700 Artem Belevich <fbsdlist@src.cx>
wrote:

> Perhaps reduced UMA fragmentation helps those subsystem that do use
> UMA (including ZFS which always uses uma for various housekeeping
> data).

PJD told me once that ZFS is always using UMA, it is just not using it
for everything (except when the sysctl is switched to use it for
everything).

FYI: I have a 9-current system which panics (without a backtrace/dump)
after 1-2 days of uptime when the zfs-uma-sysctl is activated. When it
is not activated it survives several weeks (let's say about a month).
So any work on the UMA fragmentation issue is well spend time.

No, I haven't tested any of the patches on this machine.

Bye,
Alexander.