Re: 6.0 VFS/VM over-runs. Was: Apparent strange disk behaviour in 6.0
From: Marc Olzheim (marcolz_at_stack.nl)
Date: 07/29/05
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Date: Fri, 29 Jul 2005 16:44:52 +0200 To: Julian Elischer <julian@elischer.org>
On Thu, Jul 28, 2005 at 02:13:44PM -0700, Julian Elischer wrote:
> mount a large partition that has some room.. hopefully several times
> the space of all RAM.
> .
>
> do:
>
> dd if=/dev/zero of=/${mountpoint}/bigfile bs=128k count=1000000 & iostat 1
>
>
> notice that dd dies with "not enough swapspace" after some number of
> seconds.
> (there is no swap attached). also notice that until the crash, IO speed
> was max for the
> disk.
>
> then add swap and do it again.
>
> notice that at teh point where dd previously crashed, the swap disk
> springs into life and disk IO on your main disk goes into the toilet.
> notice that dd gets swapped out. (!!!!)
>
> when the disk recovers enough, dd pages back in and creates more IO but
> in teh mean time there is no IO
> going on to the disk.. (watch the LEDs).
Just to be clear, this happens on 5-STABLE, 6-STABLE and 7-CURRENT.
Marc
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