From: Eric Dumazet <eric.dumazet@gmail.com>
To: Tom Herbert <therbert@google.com>
Cc: Andi Kleen <andi@firstfloor.org>,
"David S. Miller" <davem@davemloft.net>,
Linux Netdev List <netdev@vger.kernel.org>
Subject: Re: [PATCH net-next-2.6] net: Xmit Packet Steering (XPS)
Date: Sat, 21 Nov 2009 07:58:33 +0100 [thread overview]
Message-ID: <4B078F99.70100@gmail.com> (raw)
In-Reply-To: <65634d660911201642k3930dc78vd576e0e89dc0c794@mail.gmail.com>
Tom Herbert a écrit :
>
> It probably is a special case, but addresses a real problem. Like rps,
> this addresses the case where a single queue NIC is the bottleneck on a
> system. Anything that takes work off the interrupting core and spreads
> it to other cores may alleviate the bottleneck.
>
Yes, and this brings back an idea I mentioned earlier in April, for a multicast
problem we had with AthenaCR.
XPS could be 'started' only if caller runs from ksoftirqd, eg we are in a stress
situation, and additional cost of XPS is nothing compared to huge gains we have
to spread part of work to more CPUS.
(Costs of XPS includes : ~500 bytes of ICACHE, and IPI)
next prev parent reply other threads:[~2009-11-21 6:58 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-19 23:46 [PATCH net-next-2.6] net: Xmit Packet Steering (XPS) Eric Dumazet
2009-11-20 2:12 ` Changli Gao
2009-11-20 4:58 ` Eric Dumazet
2009-11-20 5:11 ` Changli Gao
2009-11-20 5:24 ` Eric Dumazet
2009-11-20 5:34 ` Changli Gao
2009-11-20 5:42 ` Eric Dumazet
2009-11-20 5:50 ` Changli Gao
[not found] ` <65634d660911191641o4210a797mf1e8168dd8dd8b60@mail.gmail.com>
2009-11-20 5:08 ` Eric Dumazet
2009-11-20 13:32 ` Jarek Poplawski
2009-11-20 14:45 ` Eric Dumazet
2009-11-20 20:04 ` Jarek Poplawski
2009-11-20 21:43 ` Eric Dumazet
2009-11-20 22:08 ` Jarek Poplawski
2009-11-20 22:21 ` Eric Dumazet
2009-11-20 20:51 ` Andi Kleen
2009-11-20 20:53 ` David Miller
2009-11-20 22:30 ` Eric Dumazet
2009-11-20 22:37 ` Andi Kleen
[not found] ` <65634d660911201642k3930dc78vd576e0e89dc0c794@mail.gmail.com>
2009-11-21 6:58 ` Eric Dumazet [this message]
2009-11-20 20:53 ` Jarek Poplawski
2009-11-20 21:35 ` Eric Dumazet
2009-11-20 21:43 ` Joe Perches
2009-11-20 21:49 ` David Miller
2009-11-20 22:01 ` Eric Dumazet
2009-11-20 22:34 ` David Miller
2009-11-20 22:32 ` David Miller
2009-11-20 22:36 ` Eric Dumazet
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