netdev - Re: [PATCH 1/3] sysfs directory scaling: rbtree for dirent name lookups

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Message-ID: <20091103035058.GA19515@kroah.com>
Date:	Mon, 2 Nov 2009 19:50:58 -0800
From:	Greg KH <greg@...ah.com>
To:	Benjamin LaHaise <bcrl@...et.ca>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Octavian Purdila <opurdila@...acom.com>,
	netdev@...r.kernel.org, Cosmin Ratiu <cratiu@...acom.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] sysfs directory scaling: rbtree for dirent name
	lookups

On Sun, Nov 01, 2009 at 11:31:30AM -0500, Benjamin LaHaise wrote:
> Use an rbtree in sysfs_dirent to speed up file lookup times
> 
> Systems with large numbers (tens of thousands and more) of network 
> interfaces stress the sysfs code in ways that make the linear search for 
> a name match take far too long.  Avoid this by using an rbtree.

What kind of speedups are you seeing here?  And do these changes cause a
memory increase due to the structure changes which outweigh the
speedups?

What kind of test are you doing to reproduce this?

thanks,

greg k-h
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