From: Chris Bainbridge <chris.bainbridge@gmail.com>
To: bp@alien8.de
Cc: linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org,
mchehab@infradead.org, markus@trippelsdorf.de,
tony.luck@intel.com
Subject: [BUG] packet loss with PROVE_LOCKING, bisected to EDAC fix
Date: Mon, 21 Mar 2016 21:42:09 +0000 [thread overview]
Message-ID: <20160321214209.GA8480@localhost> (raw)
Hi,
I was testing something on an old server (Dell T105 opteron) and noticed
packet loss after updating the kernel from 3.10 to 4.5. The test was:
On Dell run: iperf -s
On another system: iperf3 -c dell -u -b 20M -l 1k -t 1000
This sends a 20mbit UDP stream to the Dell. It works fine normally (0%
packet loss), but when CONFIG_PROVE_LOCKING is enabled there is high
(35%) packet loss. (DEBUG_LOCKDEP also seems to cause packet loss)
The packet loss bisected back to:
commit 88d84ac97378c2f1d5fec9af1e8b7d9a662d6b00
Author: Borislav Petkov <bp@suse.de>
Date: Fri Jul 19 12:28:25 2013 +0200
EDAC: Fix lockdep splat
I have confirmed that the commit preceding this (v3.11-rc1) is fine and
that 88d84a introduced the bug.
next reply other threads:[~2016-03-21 21:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-21 21:42 Chris Bainbridge [this message]
2016-03-22 5:31 ` [BUG] packet loss with PROVE_LOCKING, bisected to EDAC fix Borislav Petkov
2016-03-22 8:18 ` Peter Zijlstra
2016-03-22 9:16 ` Chris Bainbridge
2016-03-22 11:12 ` Borislav Petkov
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