From: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
To: cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org
Cc: jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org,
rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
ogerlitz-smomgflXvOZWk0Htik3J/w@public.gmane.org,
yosefe-smomgflXvOZWk0Htik3J/w@public.gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [IPoIB] Identify multicast packets and fix IGMP breakage V3
Date: Thu, 26 Aug 2010 17:07:16 -0700 (PDT) [thread overview]
Message-ID: <20100826.170716.68143372.davem@davemloft.net> (raw)
In-Reply-To: <alpine.DEB.2.00.1008261856090.29657-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
From: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Date: Thu, 26 Aug 2010 18:57:09 -0500 (CDT)
> On Thu, 26 Aug 2010, Jason Gunthorpe wrote:
>
>> I think doing the memcmp only in the multicast path should be
>> reasonable overhead wise.
>
> Thats is not always possible. Here the multicast path is the
> default path that is taken 99% of the time.
The highest cost is bringing in that packet header's cache line, which
you've already done by reading the byte and checking for 0xff.
I doubt the memcmp() can possibly matter.
--
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next prev parent reply other threads:[~2010-08-27 0:07 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-23 17:16 IPoIB: Broken IGMP processing Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008231210010.9840-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-23 17:41 ` Jason Gunthorpe
[not found] ` <20100823174110.GK26549-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2010-08-23 18:10 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008231254300.10719-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-23 18:28 ` Jason Gunthorpe
[not found] ` <20100823182859.GL26549-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2010-08-23 19:27 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008231427130.12815-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-23 19:34 ` Yossi Etigin
[not found] ` <7E95F01E94AB484F83061FCFA35B39F8013249-QfUkFaTmzUSUvQqKE/ONIwC/G2K4zDHf@public.gmane.org>
2010-08-23 19:45 ` Jason Gunthorpe
[not found] ` <20100823194555.GN26549-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2010-08-23 19:50 ` Yossi Etigin
[not found] ` <7E95F01E94AB484F83061FCFA35B39F801324A-QfUkFaTmzUSUvQqKE/ONIwC/G2K4zDHf@public.gmane.org>
2010-08-25 14:43 ` Christoph Lameter
2010-08-23 19:59 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008231454230.12815-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-24 18:49 ` Jason Gunthorpe
2010-08-23 18:19 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008231317150.10719-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-23 18:30 ` Jason Gunthorpe
[not found] ` <20100823183044.GM26549-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2010-08-26 19:55 ` [IPoIB] Identify Multicast packets and fix IGMP breakage Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008261453510.21466-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-26 20:49 ` Roland Dreier
[not found] ` <adapqx5rtez.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2010-08-26 21:17 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008261613160.24174-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-26 21:29 ` Jason Gunthorpe
2010-08-26 21:31 ` [IPoIB] Identify multicast packets and fix IGMP breakage V2 Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008261629440.24174-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-26 22:15 ` David Miller
[not found] ` <20100826.151553.242147157.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2010-08-26 22:21 ` Jason Gunthorpe
[not found] ` <20100826222146.GA23025-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2010-08-26 23:26 ` [IPoIB] Identify multicast packets and fix IGMP breakage V3 Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008261825490.26351-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-26 23:43 ` Jason Gunthorpe
2010-08-26 23:57 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008261856090.29657-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-08-27 0:07 ` David Miller [this message]
2010-08-27 2:24 ` Christoph Lameter
[not found] ` <20100826234342.GA24333-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2010-08-27 0:02 ` Yossi Etigin
[not found] ` <7E95F01E94AB484F83061FCFA35B39F89BE276-QfUkFaTmzUSUvQqKE/ONIwC/G2K4zDHf@public.gmane.org>
2010-08-27 0:17 ` Jason Gunthorpe
2010-08-27 13:29 ` Christoph Lameter
2010-09-14 7:27 ` Or Gerlitz
[not found] ` <4C8F23DB.2040105-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2010-09-14 14:02 ` Christoph Lameter
[not found] ` <alpine.DEB.2.00.1008270827280.11792-sBS69tsa9Uj/9pzu0YdTqQ@public.gmane.org>
2010-09-28 18:09 ` Roland Dreier
2010-08-26 21:32 ` [IPoIB] Identify Multicast packets and fix IGMP breakage Roland Dreier
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