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Re: large file problems with 2.4.25-pre4

To: Kelsey Cummings <kgc@xxxxxxxxx>
Subject: Re: large file problems with 2.4.25-pre4
From: Eric Sandeen <sandeen@xxxxxxx>
Date: Mon, 12 Jan 2004 20:36:26 -0600 (CST)
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <20040112233619.GF98119@xxxxxxxxx>
Sender: linux-xfs-bounce@xxxxxxxxxxx
The problem is probably a current bug with large allocation
groups in the filesystem; try re-mkfs'ing with -d agsize=4g
and see if the problem goes away.  I hope(!) to check in a fix
for this in the next day or two (the fix is in kernelspace,
and does not affect on-disk xfs format).

-Eric

On Mon, 12 Jan 2004, Kelsey Cummings wrote:

> I'm new to using xfs, so please forgive me if I'm missing somehting
> obvious.  I've heard good things about xfs' performance, and I have to
> admit I'm quite impressed with what I've seen so far.  However, I've run
> into some confusing problems.
> 
> With all of the XFS kernels I've build (2.4.24-pre1, 2.4.25-pre4) I've had
> trouble creating large files.  
> 
> dd if=/dev/zero of=/mnt/blah bs=1024k count=10000
> 
> locks up at app 6gigs with bdflush and kswapd consumming all available CPU.
> Once this occurs any thing attempting to access the filesystem gets stuck
> waiting on the kernel.


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