From: Marcus Meissner <meissner@suse.de>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: netdev@oss.sgi.com
Subject: Re: [patch] do not readlock all buckets in /proc/net/tcp
Date: Mon, 5 Jul 2004 13:35:55 +0200 [thread overview]
Message-ID: <20040705113555.GA28665@suse.de> (raw)
In-Reply-To: <E1BhRda-0001Rs-00@gondolin.me.apana.org.au>
On Mon, Jul 05, 2004 at 09:27:54PM +1000, Herbert Xu wrote:
> Marcus Meissner <meissner@suse.de> wrote:
> >
> > This patch makes the files /proc/net/tcp and /proc/net/tcp6 not acquire
> > the readlock for every bucket.
> >
> > On ppc64 and ia64 the readlocks are so expensive, that reading /proc/net/tcp
> > takes 0.25 seconds on a usual p670 LPAR.
> >
> > And it locks 65536 buckets where just 20 chains are used at all in a normal
> > non-netserver setup.
>
> Why not use NETLINK+TCP_DIAG instead? It's much faster.
Not sure if you want / can fix all proprietary software.
Oh, and NETLINK+TCP_DIAG seems to have the same readlock contention problem,
see tcpdiag_dump().
Ciao, Marcus
next prev parent reply other threads:[~2004-07-05 11:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-05 11:09 [patch] do not readlock all buckets in /proc/net/tcp Marcus Meissner
2004-07-05 11:27 ` Herbert Xu
2004-07-05 11:35 ` Marcus Meissner [this message]
2004-07-05 12:06 ` Herbert Xu
2004-07-05 12:25 ` YOSHIFUJI Hideaki / 吉藤英明
2004-07-05 12:45 ` Marcus Meissner
2004-07-05 13:25 ` YOSHIFUJI Hideaki / 吉藤英明
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