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From: Greg KH <greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
To: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org,
	stable-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org
Subject: Re: [stable] [PATCH 2.6.36] RDMA/cxgb3: Turn off rx coalescing for iwarp connections.
Date: Sat, 18 Sep 2010 20:58:30 -0700	[thread overview]
Message-ID: <20100919035830.GB30706@kroah.com> (raw)
In-Reply-To: <20100919003821.11904.91366.stgit-T4OLL4TyM9aNDNWfRnPdfg@public.gmane.org>

On Sat, Sep 18, 2010 at 07:38:21PM -0500, Steve Wise wrote:
> The HW by default has RX coalescing on.  For iwarp connections, this was
> causing a 100ms delay in connection establishement due to the ingress
> MPA Start message being stalled in HW.  So explicitly turn rx coalescing
> off when setting up iwarp connections.
> 
> This was causing very bad performance for NP64 gather operations using
> OpenMPI due to the way it sets up connections on larger jobs.
> 
> Signed-off-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
> ---

Please read Documentation/stable_kernel_rules.txt for how to get a patch
into the stable tree.  Hint, you are close, but this isn't going to work
this way...

thanks,

greg k-h
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  parent reply	other threads:[~2010-09-19  3:58 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-19  0:38 [PATCH 2.6.36] RDMA/cxgb3: Turn off rx coalescing for iwarp connections Steve Wise
     [not found] ` <20100919003821.11904.91366.stgit-T4OLL4TyM9aNDNWfRnPdfg@public.gmane.org>
2010-09-19  3:58   ` Greg KH [this message]
     [not found]     ` <4C97D547.60008@opengridcomputing.com>
     [not found]       ` <4C97D547.60008-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
2010-09-20 21:56         ` [stable] " Roland Dreier
     [not found]           ` <adawrqgdqq1.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2010-09-20 21:59             ` Steve Wise

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