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Re: XFS errors on large Infiniband fileserver setup

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: XFS errors on large Infiniband fileserver setup
From: Christian Herzog <horeizo@xxxxxxxxxxxx>
Date: Thu, 23 Sep 2010 16:10:02 +0200
Cc: <xfs@xxxxxxxxxxx>
In-reply-to: <20100923135425.GA32476@xxxxxxxxxxxxx>
References: <29252416bd0d9dc973a909e411dbec6a@xxxxxxxxxxxx> <eb1b2cfa58cddc44c92c3a87a0e0a6c4@xxxxxxxxxxxx> <20100923103802.GA16984@xxxxxxxxxxxxx> <5c4318884cb2c4d3983fd5231c2e4b17@xxxxxxxxxxxx> <20100923135425.GA32476@xxxxxxxxxxxxx>
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> On Thu, Sep 23, 2010 at 01:52:46PM +0200, Christian Herzog wrote:
>> > Btw, what target do you use?  According to
>> > http://www.spinics.net/lists/linux-stgt/msg02038.html it seems like the
>> > stgt iser target has some issues that look quite similar to yours.
>> we're using tgt which might have a similar problem.
> 
> tgt and stgt is actually one and the same - the name is used a little
> bit inconsistently.
oh *blush*
well I guess this might be our issue then..

>> As even IB over TCP is several times faster than our disks, we will now
>> proceed w/o iSER to have the system running and then experiment with
>> iSER on a test system.
> 
> At least for NFS using RDMA natively mostly affects CPU usage and not
> throughput, so if you have some CPU cycles to spare it might not make
> much of a difference.
even in our hardcore torture tests the system load is pretty
reasonable, so I guess we're good.

thanks,
-Christian

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