linux-kernel - Re: How git affects kernel.org performance

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Date:	Sun, 07 Jan 2007 00:58:38 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Willy Tarreau <w@....eu>
CC:	Linus Torvalds <torvalds@...l.org>, git@...r.kernel.org,
	nigel@...el.suspend2.net, "J.H." <warthog9@...nel.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Andrew Morton <akpm@...l.org>, Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	webmaster@...nel.org
Subject: Re: How git affects kernel.org performance

Willy Tarreau wrote:
> 
> At work, we had the same problem on a file server with ext3. We use rsync
> to make backups to a local IDE disk, and we noticed that getdents() took
> about the same time as Peter reports (0.2 to 2 seconds), especially in
> maildir directories. We tried many things to fix it with no result,
> including enabling dirindexes. Finally, we made a full backup, and switched
> over to XFS and the problem totally disappeared. So it seems that the
> filesystem matters a lot here when there are lots of entries in a
> directory, and that ext3 is not suitable for usages with thousands
> of entries in directories with millions of files on disk. I'm not
> certain it would be that easy to try other filesystems on kernel.org
> though :-/
> 

Changing filesystems would mean about a week of downtime for a server. 
It's painful, but it's doable; however, if we get a traffic spike during 
that time it'll hurt like hell.

However, if there is credible reasons to believe XFS will help, I'd be 
inclined to try it out.

	-hpa
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