netdev - Re: [RFC][PATCH 1/4] skbtrace: core feature

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Message-ID: <1341988323.3265.6968.camel@edumazet-glaptop>
Date:	Wed, 11 Jul 2012 08:32:03 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Li Yu <raise.sail@...il.com>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/4] skbtrace: core feature

On Wed, 2012-07-11 at 14:15 +0800, Li Yu wrote:
> 于 2012年07月11日 12:03, Eric Dumazet 写道:

> > You said that some 'buggy' drivers set rxhash to zero, but its a valid
> > operation.
> >
> > You said 'it seems that RPS hashing can not work well for some corner
> > cases', but its a known fact.
> >
> 
> Em, we really are able to verify RPS imbalance by checking the last
> column of /proc/net/softnet_stat, but skbtrace can give us more details
> of RSS/RPS hashing. For improper RPS hashing case, it can provide more
> details of what really happen in real time.

A hash is a hash. Its rarely perfect.

RPS is a best effort, and not suitable for all needs.

If you follow netdev, maybe you saw that I suggested to use a BPF to
compute the hash, for specialized needs.

Of course, RFS can also help right now.


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