netdev - Re: RPS and forwarding

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Message-ID: <r2n65634d661004252200x4e7a49f1h181cdd69b3e4ebc0@mail.gmail.com>
Date:	Sun, 25 Apr 2010 22:00:09 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	Herbert Xu <herbert@...dor.hengli.com.au>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: RPS and forwarding

> 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?
>
RFS is not on at run-time by default.  The number of entries in the
global_rps_sock table needs to be set in sysctl, and the number of
entries in rps_dev_flow_table needs to be set per RX queue in sysfs.
You can turn it on for some devices, but not others if that helps.

> Cheers,
> --
> Visit Openswan at http://www.openswan.org/
> Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
>
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