| 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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