From: "H. Peter Anvin" <hpa@zytor.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Ray Lee <ray-lk@madrabbit.org>,
renton@renton.name, linux-kernel@vger.kernel.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: devpts mounts too slowly
Date: Wed, 10 Jun 2009 13:51:25 -0700 [thread overview]
Message-ID: <4A301CCD.7070707@zytor.com> (raw)
In-Reply-To: <20090609165304.add1a872.akpm@linux-foundation.org>
Andrew Morton wrote:
>
> hm, OK.
>
> I've now mounted 15000 devpts's and still no slowdown is evident.
I ran my test script, mounting ramfs, with n=100000, and well, gave up
since it hadn't gotten any further than 57000 or so overnight. At that
time each individual mount was taking several seconds.
Graphing the delays seem to indicate O(n^2) behavior.
umounts do not appear affected; each umount still take negible time.
-hpa
next parent reply other threads:[~2009-06-10 20:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090603142801.GC21646@beaver.vrungel.ru>
[not found] ` <4A26EB18.6060907@zytor.com>
[not found] ` <20090609161945.811cc01f.akpm@linux-foundation.org>
[not found] ` <2c0942db0906091630l1cc79647h8689e9e929ed1bba@mail.gmail.com>
[not found] ` <20090609165304.add1a872.akpm@linux-foundation.org>
2009-06-10 20:51 ` H. Peter Anvin [this message]
2009-06-24 20:01 ` devpts mounts too slowly Al Viro
2009-06-24 21:58 ` Andrew Morton
2009-06-24 23:02 ` H. Peter Anvin
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