linux-kernel - Re: [PATCH 1/3] Kernel interfaces for multiqueue aware socket

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Date:	Thu, 16 Dec 2010 06:00:27 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Junchang Wang <junchangwang@...il.com>
Cc:	Fenghua Yu <fenghua.yu@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	John Fastabend <john.r.fastabend@...el.com>,
	Xinan Tang <xinan.tang@...el.com>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] Kernel interfaces for multiqueue aware socket

Le jeudi 16 décembre 2010 à 09:52 +0800, Junchang Wang a écrit :
> On Thu, Dec 16, 2010 at 4:48 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >> With this patch, the user-space receiving speed on a Intel SR1690 server with
> >> a single L5640 6-core processor and a single ixgbe-based NIC goes from 0.73Mpps
> >> to 4.20Mpps, nearly a linear speedup. A Intel SR1625 server two E5530 4-core
> >> processors and a single ixgbe-based NIC goes from 0.80Mpps to 4.6Mpps. We noticed
> >> the performance penalty comes from NUMA memory allocation.
> >>
> >
> > ??? please elaborate on these NUMA memory allocations. This should be OK
> > after commit 564824b0c52c34692d (net: allocate skbs on local node)
> >
> Hi Eric,
> Commit 564824b0c52c34692d had been used in the experiments, but the problem
> remained unsolved.
> 
> SLUB was used, and both servers were equipped with 8G physical memory.
> Is there any
> additional information I can provide?
> 

Yes, sure, you could provide a description of the bench you used, and
data you gathered to make the conclusion that NUMA was a problem.



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