[Linux-cachefs] Possible patch for CacheFiles: I/O Error: Unlink failed

[Greg M]

I believe my fscache mount is ext3 - would moving it to ext4 yield
beneficial difference?

Greg

-----Original Message-----
From: linux-cachefs-bounces at redhat.com
[mailto:linux-cachefs-bounces at redhat.com] On Behalf Of Romain DEGEZ
Sent: Friday, 2 April 2010 12:30 AM
To: linux-cachefs at redhat.com
Subject: Re: [Linux-cachefs] Possible patch for CacheFiles: I/O Error:
Unlink failed

On Thursday 01 April 2010 18:21:46 Greg M wrote:
> Success! The bug that had been plaguing me for month is now fixed, 
> however the load seems to be unusually high:

Same here, not a single EIO issue.
 
> top - 11:16:31 up 52 min,  2 users,  load average: 6.85, 3.83, 2.29
> Tasks:  96 total,   4 running,  92 sleeping,   0 stopped,   0 zombie
> Cpu0  :  0.9%us,  3.5%sy,  0.0%ni, 10.0%id, 81.7%wa,  1.3%hi,  2.6%si, 
> 0.0%st
> Cpu1  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si, 
> 0.0%st
> Cpu2  :  1.7%us,  1.3%sy,  0.0%ni, 95.7%id,  1.3%wa,  0.0%hi,  0.0%si, 
> 0.0%st
> Cpu3  :  0.0%us, 34.9%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi, 65.1%si, 
> 0.0%st
> Mem:   4057892k total,  2616856k used,  1441036k free,  1087752k buffers
> Swap:  2104504k total,        0k used,  2104504k free,  1112304k cached
> 
> >From what I can tell, this is due to massive writes on the disk

[...]

> Hopefully it will settle down.

On my side, appart from the normal 're-caching' of the data after a fresh
ext4 reformating I have not seen unusual write-load.

> Also - Is it possible to use a RAMdisk for /var/fscache?
> 
> This would obviously provide 4GB of super fast caching .
> 
> Greg

Isn't this supposed to be the buffer-cache job ? :-)

--
RD

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