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

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Message-ID: <AANLkTikc+QTPH2He=fKgWiRGk=6sn9Phaa259YdkQNix@mail.gmail.com>
Date:	Thu, 16 Dec 2010 09:52:28 +0800
From:	Junchang Wang <junchangwang@...il.com>
To:	Eric Dumazet <eric.dumazet@...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

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?

Thanks.
-- 
--Junchang
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