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Re: XFS with nfs over rdma performance

To: Samuel Kvasnica <samuel.kvasnica@xxxxxxxxx>
Subject: Re: XFS with nfs over rdma performance
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Tue, 22 Jan 2013 12:39:26 +0100
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <50FE73A4.7020308@xxxxxxxxx>
Organization: Intellique
References: <50FE73A4.7020308@xxxxxxxxx>
Le Tue, 22 Jan 2013 12:10:28 +0100
Samuel Kvasnica <samuel.kvasnica@xxxxxxxxx> écrivait:

> We do not see any remarkable CPU load.

What does the output from iostat -mx 3 looks like while  you're writing
or reading?
 
> The interesting point is, we use btrfs filesystem on server instead of
> xfs now (with otherwise same config) and we are getting consistent,
> steady throughput
> around 1.2-1.3GB/s.
> 
> What is wrong with XFS on 3.x kernel ? Any hints what parameters to
> look at ?

What mkfs and mount options did you use? With a large array nobarrier
and inode64 may make a big difference.

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