From: Andi Kleen <andi@firstfloor.org>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Andi Kleen <andi@firstfloor.org>,
Linux Netdev List <netdev@vger.kernel.org>
Subject: Re: [RFC] Could we avoid touching dst->refcount in some cases ?
Date: Mon, 24 Nov 2008 12:27:09 +0100 [thread overview]
Message-ID: <20081124112709.GX6703@one.firstfloor.org> (raw)
In-Reply-To: <492A7E85.3060502@cosmosbay.com>
On Mon, Nov 24, 2008 at 11:14:29AM +0100, Eric Dumazet wrote:
> Andi Kleen a écrit :
> >Eric Dumazet <dada1@cosmosbay.com> writes:
> >
> >>tbench has hard time incrementing decrementing the route cache refcount
> >>shared by all communications on localhost.
> >
> >iirc there was a patch some time ago to use per CPU loopback devices to
> >avoid this, but it was considered too much a benchmark hack.
> >As core counts increase it might stop being that though.
>
> Well, you probably mention Stephen patch to avoid dirtying other contended
> cache lines (one napi structure per cpu)
No that patch wasn't from Stephen. iirc it was from someone at SGI.
-Andi
--
ak@linux.intel.com
next prev parent reply other threads:[~2008-11-24 11:16 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-24 8:57 [RFC] Could we avoid touching dst->refcount in some cases ? Eric Dumazet
2008-11-24 9:42 ` Andi Kleen
2008-11-24 10:14 ` Eric Dumazet
2008-11-24 11:24 ` [PATCH] net: avoid a pair of dst_hold()/dst_release() in ip_append_data() Eric Dumazet
2008-11-24 13:59 ` [PATCH] net: avoid a pair of dst_hold()/dst_release() in ip_push_pending_frames() Eric Dumazet
2008-11-25 0:07 ` David Miller
2008-11-24 23:55 ` [PATCH] net: avoid a pair of dst_hold()/dst_release() in ip_append_data() David Miller
2008-11-25 2:22 ` Andi Kleen
2008-11-24 11:27 ` Andi Kleen [this message]
2008-11-24 23:36 ` [RFC] Could we avoid touching dst->refcount in some cases ? David Miller
2008-11-24 23:39 ` David Miller
2008-11-25 4:43 ` Eric Dumazet
2008-11-25 5:00 ` David Miller
2008-11-26 0:00 ` [PATCH] net: release skb->dst in sock_queue_rcv_skb() Eric Dumazet
2008-11-26 0:23 ` David Miller
2008-11-26 2:04 ` David Miller
2008-11-26 7:39 ` Eric Dumazet
2008-11-26 9:08 ` David Miller
2008-12-17 11:25 ` net-next: broken IP_PKTINFO [was Re: [PATCH] net: release skb->dst in sock_queue_rcv_skb()] Mark McLoughlin
2008-12-18 3:34 ` net-next: broken IP_PKTINFO David Miller
2008-12-18 5:59 ` Eric Dumazet
2008-12-18 6:17 ` David Miller
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