From: Andi Kleen <andi@firstfloor.org>
To: jamal <hadi@cyberus.ca>
Cc: Andi Kleen <andi@halobates.de>, Tom Herbert <therbert@google.com>,
davem@davemloft.net, netdev@vger.kernel.org,
eric.dumazet@gmail.com
Subject: Re: [PATCH v5] rfs: Receive Flow Steering
Date: Fri, 16 Apr 2010 15:42:36 +0200 [thread overview]
Message-ID: <20100416134236.GA18855@one.firstfloor.org> (raw)
In-Reply-To: <1271424726.4606.42.camel@bigi>
On Fri, Apr 16, 2010 at 09:32:06AM -0400, jamal wrote:
> How are you going to schedule the net softirq on an empty queue if you
> do this?
Sorry don't understand the question?
You can always do the flow as if rps was not there.
> BTW, in my tests sending an IPI to an SMT sibling or to another core
> didnt make any difference in terms of latency - still 5 microsecs.
> I dont have dual Nehalem where we have to cross QPI - there i suspect
> it will be longer than 5 microsecs.
I meant an IPI to a sibling is not useful. You send it to the IPI
to get cache locality in the target, but if the target has the same
cache locality as you you can as well avoid the cost of the IPI
and process directly.
For thread sibling I'm pretty sure it's useless. Not full sure about
socket sibling. Maybe.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2010-04-16 13:42 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-16 5:47 [PATCH v5] rfs: Receive Flow Steering Tom Herbert
2010-04-16 6:33 ` David Miller
2010-04-16 6:56 ` Eric Dumazet
2010-04-16 7:18 ` Eric Dumazet
2010-04-16 7:26 ` David Miller
2010-04-16 7:48 ` Eric Dumazet
2010-04-17 7:52 ` [PATCH net-next-2.6] rps: rps_sock_flow_table is mostly read Eric Dumazet
2010-04-17 7:57 ` David Miller
2010-04-16 15:35 ` [PATCH v5] rfs: Receive Flow Steering Tom Herbert
2010-04-16 18:15 ` Eric Dumazet
2010-04-16 18:35 ` Tom Herbert
2010-04-16 18:53 ` Eric Dumazet
2010-04-16 20:42 ` Tom Herbert
2010-04-16 21:12 ` Eric Dumazet
2010-04-16 21:25 ` Eric Dumazet
2010-04-17 16:10 ` Eric Dumazet
2010-04-17 17:38 ` Tom Herbert
2010-04-18 0:06 ` Changli Gao
2010-04-18 11:06 ` Franco Fichtner
2010-04-19 20:09 ` David Miller
2010-04-19 20:23 ` David Miller
2010-04-19 20:32 ` Eric Dumazet
2010-04-19 21:19 ` David Miller
2010-04-26 8:41 ` Eric Dumazet
2010-04-27 21:59 ` David Miller
2010-04-27 22:08 ` Eric Dumazet
2010-04-27 22:10 ` David Miller
2010-04-19 23:38 ` Changli Gao
2010-04-20 5:59 ` Eric Dumazet
2010-04-20 7:56 ` [PATCH net-next-2.6] rps: consistent rxhash Eric Dumazet
2010-04-20 8:18 ` David Miller
2010-04-20 12:48 ` Franco Fichtner
2010-04-20 13:16 ` Eric Dumazet
2010-04-20 14:03 ` Franco Fichtner
2010-04-20 14:57 ` Eric Dumazet
2010-04-20 21:41 ` David Miller
2010-04-20 23:35 ` Changli Gao
2010-04-20 23:38 ` David Miller
2010-04-21 19:12 ` Tom Herbert
2010-04-23 20:44 ` David Miller
2010-05-06 8:06 ` David Miller
2010-05-06 14:45 ` Tom Herbert
2010-04-20 15:09 ` Tom Herbert
2010-04-21 9:29 ` Franco Fichtner
2010-04-21 9:39 ` Eric Dumazet
2010-04-21 11:06 ` Franco Fichtner
2010-04-21 11:16 ` Eric Dumazet
2010-04-20 15:04 ` [PATCH v5] rfs: Receive Flow Steering Tom Herbert
2010-04-20 15:39 ` Eric Dumazet
2010-04-16 19:37 ` Eric Dumazet
2010-04-16 22:49 ` David Miller
2010-04-16 22:53 ` David Miller
2010-04-16 22:57 ` David Miller
2010-04-17 0:22 ` Tom Herbert
2010-04-17 0:58 ` David Miller
2010-04-16 11:57 ` Andi Kleen
2010-04-16 13:32 ` jamal
2010-04-16 13:42 ` Andi Kleen [this message]
2010-04-16 14:05 ` jamal
2010-04-16 15:28 ` Andi Kleen
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