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Re: 12x performance drop on md/linux+sw raid1 due to barriers [xfs]

To: Bill Davidsen <davidsen@xxxxxxx>
Subject: Re: 12x performance drop on md/linux+sw raid1 due to barriers [xfs]
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Thu, 11 Dec 2008 04:24:58 -0500 (EST)
Cc: linux-raid@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, Alan Piszcz <ap@xxxxxxxxxxxxx>
In-reply-to: <alpine.DEB.1.10.0812110416550.14590@xxxxxxxxxxxxxxxx>
References: <alpine.DEB.1.10.0812060928030.14215@xxxxxxxxxxxxxxxx> <49405CD5.4070704@xxxxxxx> <alpine.DEB.1.10.0812110416550.14590@xxxxxxxxxxxxxxxx>
User-agent: Alpine 1.10 (DEB 962 2008-03-14)


On Thu, 11 Dec 2008, Justin Piszcz wrote:



On Wed, 10 Dec 2008, Bill Davidsen wrote:

Justin Piszcz wrote:
Someone should write a document with XFS and barrier support, if I recall,



Best not to do things in a rush, here is the correct benchmark:

# rm -rf linux*7
# sync
# echo 1 > /proc/sys/vm/drop_caches
# /usr/bin/time bash -c 'tar xf linux-2.6.27.7.tar; sync'
0.13user 1.62system 0:46.67elapsed 3%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (17major+955minor)pagefaults 0swaps

Justin.

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