From: Ingo Molnar <mingo@elte.hu>
To: Ayaz Abdulla <AAbdulla@nvidia.com>
Cc: akpm@linux-foundation.org, jeff@garzik.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Adrian Bunk <bunk@stusta.de>
Subject: [bug] forcedeth: hung interface under load
Date: Tue, 3 Apr 2007 09:05:14 +0200 [thread overview]
Message-ID: <20070403070514.GA22940@elte.hu> (raw)
In-Reply-To: <20070403062629.GA13210@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
>
> > I had responded eariler to the thread asking you to try out the patch
> > found in bug 8058:
> > http://bugzilla.kernel.org/show_bug.cgi?id=8058
> >
> > I believe that is the caush of the NULL skb dereference issue.
>
> there's a different type of regression now: under high load i dont get
> a crash, i get a hung interface instead. No error packets or other
> weird interface state - just a hung interface. [...]
the interface stats do not change from that point on:
eth1 Link encap:Ethernet HWaddr 00:13:D4:DC:41:12
inet addr:10.0.1.12 Bcast:10.0.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14976 errors:0 dropped:0 overruns:0 frame:0
TX packets:3928743 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1028544 (1004.4 KiB) TX bytes:4126766510 (3.8 GiB)
Interrupt:16 Base address:0xa000
and the irq count does not change either:
16: 816 3463148 IO-APIC-fasteoi eth1
no matter what i do to the interface. So it's completely stuck.
No kernel messages either - apparently nv_tx_timeout() never triggered.
note, the hang occurs faster if you set max_interrupt_work to a really
low value (such as 0). [ The hang occurs _much_ faster if you apply the
-rt patch and enable PREEMPT_RT - but the hang occurs on mainline too. ]
Ingo
next prev parent reply other threads:[~2007-04-03 7:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-27 5:47 [patch 10/10] forcedeth: work around NULL skb dereference crash akpm
2007-04-02 11:53 ` Ingo Molnar
2007-04-02 17:34 ` Ayaz Abdulla
2007-04-02 19:10 ` Ingo Molnar
2007-04-03 6:26 ` Ingo Molnar
2007-04-03 7:05 ` Ingo Molnar [this message]
2007-04-06 10:51 ` [bug] forcedeth: hung interface under load Ingo Molnar
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