netdev - Re: [PATCH] net: fix saving TX flow hash in sock for outgoing connections

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Message-ID: <1414004996.9031.20.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 22 Oct 2014 12:09:56 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sathya Perla <Sathya.Perla@...lex.Com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"therbert@...gle.com" <therbert@...gle.com>
Subject: Re: [PATCH] net: fix saving TX flow hash in sock for outgoing
 connections

On Wed, 2014-10-22 at 18:35 +0000, Sathya Perla wrote:
> > -----Original Message-----
> > From: Eric Dumazet [mailto:eric.dumazet@...il.com]

> > 
> > Are you really using the socket/flow hash to select a TXQ ?
> Yes, as I don't have XPS configured on my setup.
> netdev_pick_tx() uses the socket/flow hash when XPS is not used.

Yes, this is the (poor) fallback

> 
> > 
> > Even with this patch, you have a good probability of multiple
> > cpus hitting same TXQ.
> Agree. Are you suggesting that drivers should automatically
> register an XPS configuration? I thought it was upto the user
> to enable it...

Yep, search for netif_set_xps_queue()

(commit 537c00de1c9ba9876b9)

Look at commit d03a68f8217ea0349 for an example of how it can be done,
if user do not override this later.



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