From: Herbert Xu <herbert@gondor.apana.org.au>
To: Tom Herbert <therbert@google.com>
Cc: "David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org
Subject: Re: RPS and forwarding
Date: Mon, 26 Apr 2010 12:53:16 +0800 [thread overview]
Message-ID: <20100426045316.GA21810@gondor.apana.org.au> (raw)
In-Reply-To: <z2w65634d661004252144z1bf72880wdf7a0143b8490ddf@mail.gmail.com>
On Sun, Apr 25, 2010 at 09:44:05PM -0700, Tom Herbert wrote:
>
> I think you'd want RPS on router (steering packets using hash and CPU
> mask). Most of your concerns are about RFS (steering by flows), which
> is probably more appropriate for a server.
Right. The problem is that if you run a distribution kernel on
a router with CONFIG_RPS (and hence RFS) enabled, you may suddenly
start seeing packet reordering on forwarded traffic due to the
presence of local traffic.
Can we perhaps add a run-time toggle to disable RFS?
Cheers,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
next prev parent reply other threads:[~2010-04-26 4:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-26 2:24 RPS and forwarding Herbert Xu
2010-04-26 4:44 ` Tom Herbert
2010-04-26 4:53 ` Herbert Xu [this message]
2010-04-26 5:00 ` Tom Herbert
2010-04-26 6:28 ` David Miller
2010-04-26 6:31 ` Herbert Xu
2010-04-26 7:25 ` Eric Dumazet
2010-04-26 7:30 ` Herbert Xu
2010-04-26 7:38 ` Eric Dumazet
2010-04-26 7:41 ` Herbert Xu
2010-04-26 5:15 ` Eric Dumazet
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