linux-kernel - Re: Page alloc failures under network/disk IO load

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Date:	Thu, 04 Dec 2008 18:09:19 -0500
From:	Dan Noé <dpn@...merica.net>
To:	Francois Romieu <romieu@...zoreil.com>
CC:	Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: Page alloc failures under network/disk IO load

Francois Romieu wrote:
> Dan Noé <dpn@...merica.net> :
> [...]
>> I'm a bit confused because on another system (2.6.26.3) I never see
>> messages like this despite having the same amount of physical RAM in
>> each.  The 2.6.26.3 system is also under more active use, and has more
>> userspace memory usage.  On that system:
> 
> Does this system use the same network card ?

Nope, good point :)  The system experiencing the allocation failures is
using an rtl8169 gigabit NIC (at 1gbps), the 2.6.26.3 system is on a
100M connection with a gigabit Broadcom BCM5721 / tg3.

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)

04:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721
Gigabit Ethernet PCI Express (rev 11)

I can see how this could account for different behavior, although
presumably both drivers are calling __netdev_alloc_skb.

Cheers,
Dan

-- 
                    /--------------- - -  -  -   -   -
                    |  Dan Noé
                    |  http://isomerica.net/~dpn/
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