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Re: xattr limits

To: David Zafman <david.zafman@xxxxxxxxxxx>
Subject: Re: xattr limits
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 4 Oct 2013 04:16:40 -0700
Cc: "ceph-devel@xxxxxxxxxxxxxxx" <ceph-devel@xxxxxxxxxxxxxxx>, Loic Dachary <loic@xxxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <31BF914D-D406-428E-8671-0005901E10E6@xxxxxxxxxxx>
References: <C1F9D079-3D19-4A39-872A-0CAF8EA3866F@xxxxxxxxx> <524E59FC.9030903@xxxxxxxxxxx> <31BF914D-D406-428E-8671-0005901E10E6@xxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
Might be good to send the crash report to the XFS list..

On Thu, Oct 03, 2013 at 11:54:29PM -0700, David Zafman wrote:
> 
> Here is the test script:
> 


> 
> David Zafman
> Senior Developer
> http://www.inktank.com
> 
> 
> 
> 
> On Oct 3, 2013, at 11:02 PM, Loic Dachary <loic@xxxxxxxxxxx> wrote:
> 
> > Hi David,
> > 
> > Would you mind attaching the script to the mail for completness ? It's a 
> > useful thing to have :-)
> > 
> > Cheers
> > 
> > On 04/10/2013 01:21, David Zafman wrote:
> >> 
> >> I want to record with the ceph-devel archive results from testing limits 
> >> of xattrs for Linux filesystems used with Ceph.
> >> 
> >> Script that creates xattrs with name user.test1, user.test2, ?. on a 
> >> single file
> >> 3.10 linux kernel
> >> 
> >> ext4  
> >> value bytes       number of entries
> >>    1               148
> >>   16             103
> >>  256          14
> >>  512            7
> >>  1024         3
> >> 4036          1 
> >> Beyond this immediately get ENOSPC
> >> 
> >> btrfs    
> >> value bytes       number of entries
> >> 8                   10k
> >> 16                 10k
> >> 32                  10k
> >> 64                  10k
> >> 128                 10k
> >> 256                 10k
> >> 512                        10k  slow but worked 1,000,000 got completely 
> >> hung for minutes at a time during removal strace showed no forward progress
> >> 1024                10k
> >> 2048                10k
> >> 3096                10k
> >> Beyond this you start getting ENOSPC after fewer entries
> >> 
> >> xfs (limit entries due to xfs crash with 10k entries)
> >> value bytes       number of entries
> >> 1                          1k
> >> 8                           1k
> >> 16                          1k
> >> 32                          1k
> >> 64                         1k
> >> 128                 1k
> >> 256                        1k
> >> 512                 1k
> >> 1024               1k
> >> 2048                1k
> >> 4096                1k
> >> 8192                1k
> >> 16384               1k
> >> 32768               1k
> >> 65536               1k
> >> 
> >> --
> >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
> >> the body of a message to majordomo@xxxxxxxxxxxxxxx
> >> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >> 
> > 
> > -- 
> > Lo?c Dachary, Artisan Logiciel Libre
> > All that is necessary for the triumph of evil is that good people do 
> > nothing.
> > 
> 

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