Re: [CentOS-devel] More XFS Filesystem Tips

On Tuesday 01 May 2007 08:28, Feizhou wrote:

...

3.) Use the deadline I/O scheduler, anticipatory and XFS don't like each other. This is true for almost any FS != ext3. This makes a difference especially for OLTP.

Default on Centos 5 should be neither. It is CFQ IIRC.

Here's a quick (if slightly older) writeup of CFQ, which mentions some code was borrowed from the Anticipatory Scheduler.

http://lwn.net/Articles/114770/

And here's a post from what seems to be the developer stating it explicitly.

http://lwn.net/Articles/114773/

I have no idea whether the shared code contains the portions that XFS finds fault with.