From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Vivek Kashyap <kashyapv-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: Pradeep Satyanarayana
<pradeeps-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
"Hefty,
Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
sri-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org
Subject: Re: rsockets and other performance
Date: Fri, 15 Jun 2012 11:19:19 -0600 [thread overview]
Message-ID: <20120615171919.GA17224@obsidianresearch.com> (raw)
In-Reply-To: <alpine.LRH.2.00.1206142336220.13728-Nzfcc2Us4m+Xfo/+vza+31aTQe2KTcn/@public.gmane.org>
On Thu, Jun 14, 2012 at 11:48:09PM -0700, Vivek Kashyap wrote:
> >I don't think anyone ever made patches for this, but considering the
> >performance delta you see it really seems worthwhile.
>
> How about something like below? Basically the the 'checksum-less'
> operation is only between hosts that both support it by extending
> the existing IB connection setup mechanism. The following also keeps
> the changes confined to ipoib-cm module.
It is much better to do things properly (as I described) so you don't
have a gotcha when a packet gets routed.
We don't want to fake that we are doing csum, we want to forward the
csum offload data to the other side, which might discard it or might
use it to forward the packet out another interface. This is not hard,
just fiddly work.
--
Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> (780)4406067x832
Chief Technology Officer, Obsidian Research Corp Edmonton, Canada
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next prev parent reply other threads:[~2012-06-15 17:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-14 15:24 rsockets and other performance Pradeep Satyanarayana
[not found] ` <4FDA0233.6090409-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2012-06-14 16:02 ` Hefty, Sean
2012-06-14 16:09 ` Sridhar Samudrala
[not found] ` <1339690194.14317.5.camel-5vSEHtyIv2TJ4MwkZ4db91aTQe2KTcn/@public.gmane.org>
2012-06-17 7:22 ` Or Gerlitz
[not found] ` <4FDD85B3.2090406-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2012-06-17 21:20 ` Pradeep Satyanarayana
2012-06-14 17:22 ` Jason Gunthorpe
[not found] ` <20120614172245.GC6552-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2012-06-15 6:48 ` Vivek Kashyap
[not found] ` <alpine.LRH.2.00.1206142336220.13728-Nzfcc2Us4m+Xfo/+vza+31aTQe2KTcn/@public.gmane.org>
2012-06-15 17:19 ` Jason Gunthorpe [this message]
[not found] ` <20120615171919.GA17224-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2012-06-18 6:37 ` Vivek Kashyap
[not found] ` <alpine.LRH.2.00.1206172330220.13728-Nzfcc2Us4m+Xfo/+vza+31aTQe2KTcn/@public.gmane.org>
2012-06-18 17:53 ` Jason Gunthorpe
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