linux-kernel - Re: [2.6.25-rc2, 2.6.24-rc8] page allocation failure...

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Date:	Sun, 24 Feb 2008 12:37:36 +0000
From:	"Daniel J Blueman" <daniel.blueman@...il.com>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: [2.6.25-rc2, 2.6.24-rc8] page allocation failure...

On Tue, Feb 19, 2008 at 5:37 PM, Kok, Auke <auke-jan.h.kok@...el.com> wrote:
> Andrew Morton wrote:
>  > On Sun, 17 Feb 2008 13:20:59 +0000 "Daniel J Blueman" <daniel.blueman@...il.com> wrote:
>  >> I'm still hitting this with e1000e on 2.6.25-rc2, 10 times again.

>  are you sure? I don't think that's the case and you're seeing e1000 dumps here...

Indeed so! I thought I moved to e1000e a time ago, but forgot that I
had moved back due to lack of support for 82566DC, added since.

I'm not seeing any related messages with e1000e after a few days'
uptime, so all looks well...

Thanks again,
  Daniel

>  >> It's clearly non-fatal, but then do we expect it to occur?
>  >>
>  >> Daniel
>  >>
>  >> --- [dmesg]
>  >>
>  >> [ 1250.822786] swapper: page allocation failure. order:3, mode:0x4020
>  >> [ 1250.822786] Pid: 0, comm: swapper Not tainted 2.6.25-rc2-119 #2
>  >> [ 1250.822786]
>  >> [ 1250.822786] Call Trace:
>  >> [ 1250.822786]  <IRQ>  [<ffffffff8025fe9e>] __alloc_pages+0x34e/0x3a0
>  >> [ 1250.822786]  [<ffffffff8048c6df>] ? __netdev_alloc_skb+0x1f/0x40
>  >> [ 1250.822786]  [<ffffffff8027acc2>] __slab_alloc+0x102/0x3d0
>  >> [ 1250.822786]  [<ffffffff8048c6df>] ? __netdev_alloc_skb+0x1f/0x40
>  >> [ 1250.822786]  [<ffffffff8027b8cb>] __kmalloc_track_caller+0x7b/0xc0
>  >> [ 1250.822786]  [<ffffffff8048b74f>] __alloc_skb+0x6f/0x160
>  >> [ 1250.822786]  [<ffffffff8048c6df>] __netdev_alloc_skb+0x1f/0x40
>  >> [ 1250.822786]  [<ffffffff8042652d>] e1000_alloc_rx_buffers+0x1ed/0x260
>  >> [ 1250.822786]  [<ffffffff80426b5a>] e1000_clean_rx_irq+0x22a/0x330
>  >> [ 1250.822786]  [<ffffffff80422981>] e1000_clean+0x1e1/0x540
>  >> [ 1250.822786]  [<ffffffff8024b7a5>] ? tick_program_event+0x45/0x70
>  >> [ 1250.822786]  [<ffffffff804930ba>] net_rx_action+0x9a/0x150
>  >> [ 1250.822786]  [<ffffffff802336b4>] __do_softirq+0x74/0xf0
>  >> [ 1250.822786]  [<ffffffff8020c5fc>] call_softirq+0x1c/0x30
>  >> [ 1250.822786]  [<ffffffff8020eaad>] do_softirq+0x3d/0x80
>  >> [ 1250.822786]  [<ffffffff80233635>] irq_exit+0x85/0x90
>  >> [ 1250.822786]  [<ffffffff8020eba5>] do_IRQ+0x85/0x100
>  >> [ 1250.822786]  [<ffffffff8020a5b0>] ? mwait_idle+0x0/0x50
>  >> [ 1250.822786]  [<ffffffff8020b981>] ret_from_intr+0x0/0xa
>  >> [ 1250.822786]  <EOI>  [<ffffffff8020a5f5>] ? mwait_idle+0x45/0x50
>  >> [ 1250.822786]  [<ffffffff80209a92>] ? enter_idle+0x22/0x30
>  >> [ 1250.822786]  [<ffffffff8020a534>] ? cpu_idle+0x74/0xa0
>  >> [ 1250.822786]  [<ffffffff80527825>] ? rest_init+0x55/0x60
>  >
>  > They're regularly reported with e1000 too - I don't think aything really
>  > changed.
>  >
>  > e1000 has this crazy problem where because of a cascade of follies (mainly
>  > borked hardware) it has to do a 32kb allocation for a 9kb(?) packet.  It
>  > would be sad if that was carried over into e1000e?
>
>  can't be, I personally removed that code.
>
>  for MTU > 1500 e1000e uses a plain normal sized SKB. for anything bigger e1000e
>  uses pages.
>
>  so I don't see how this bug could still be showing up for e1000e at all. The large
>  skb receive code is all gone (literally, removed).
>
>  *please* rmmod e1000; modprobe e1000e and show the dumps again so we know for sure
>  that we're not looking at e1000 dumps.
>
>  short fix: increase ring size for e1000 with `modprobe e1000 RxDescriptors=4096`
>  (or use ethtool) and `echo -n 8192 > /proc/sys/vm/min_free_kbytes` or something
>  like that.
>
>  what nic hardware is this on? lspci?
>
>  Auke
>



-- 
Daniel J Blueman
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