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Re: Mounted xfs slows down block device

To: Jan Engelhardt <jengelh@xxxxxxxxxx>
Subject: Re: Mounted xfs slows down block device
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 3 Sep 2009 11:48:39 -0400
Cc: xfs@xxxxxxxxxxx
In-reply-to: <alpine.LSU.2.00.0908251325410.9492@xxxxxxxxxxxxxxxxxxxxxxxxx>
References: <alpine.LSU.2.00.0908251325410.9492@xxxxxxxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.19 (2009-01-05)
Strange, as XFS doesn't actually use the block device mapping at all,
so all the caching doesn't interact with each other.  Maybe some
throtteling code in the VM doesn't like these parallel accesses.

But I need to add that reading the block device on a mounted filesystem
is not a good idea anyay - you will not get any sort of concistency
guarantee.

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