ZFS v13 performance drops with low memory on FreeBSD-7 STABLE

[Kip Macy]

The inactive queue can cause the ARC to be shrunk down to almost
nothing. This is in need of fixing.

Cheers,
Kip

On Mon, Jun 8, 2009 at 12:01 AM, Kai Gallasch<gallasch at free.de> wrote:
> On Mon, 08 Jun 2009 02:55:22 +0200
> wrote Ivan Voras <ivoras at freebsd.org>:
>
>> Kai Gallasch wrote:
>> > Hi.
>> >
>> > So for me this looks like when running applications and ZFS compete
>> > for free RAM, ZFS looses. Is that so?
>>
>> Yes, that was the point of recent work in stabilizing ZFS - without it
>> you would probably panic. With it, ZFS's memory is shrunk down. Unless
>> there are other factors (like swapping; are you swapping on ZFS?),
>> this is the probable reason for what you're seeing.
>
> No. Swapspace is on a standard swap partition outside the zpool.
> # swapinfo
> Device          1K-blocks     Used    Avail Capacity
> /dev/da0s3b       8388608    11636  8376972     0%
>
> There's barely swapping taking place on the server.
>
> --Kai.
>
>
>



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