netdev - Re: e1000e tx queue timeout in 3.3.0 (bisected to BQL support for e1000e)

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Message-ID: <4F91D409.1040401@candelatech.com>
Date:	Fri, 20 Apr 2012 14:24:25 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Tom Herbert <therbert@...gle.com>
CC:	John Fastabend <john.r.fastabend@...el.com>,
	netdev <netdev@...r.kernel.org>,
	e1000-devel list <e1000-devel@...ts.sourceforge.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: e1000e tx queue timeout in 3.3.0 (bisected to BQL support for
 e1000e)

On 04/20/2012 02:21 PM, Tom Herbert wrote:
> Thanks John for pointers to those.  Ben, are you running a kernel with
> these patches?

I don't think so.  I'll add them and re-test.

Thanks,
Ben

>
> Tom
>
>>
>> Tom, did you see these two patches? Maybe this is resolved by
>> the second patch.
>>
>> We needed these to fixup ixgbe and igb (i didn't test e1000e)
>> looks like we might want to push these at stable. I don't
>> believe they are in 3.3.
>>
>> commit b37c0fbe3f6dfba1f8ad2aed47fb40578a254635
>> Author: Alexander Duyck<alexander.h.duyck@...el.com>
>> Date:   Tue Feb 7 02:29:06 2012 +0000
>>
>>     net: Add memory barriers to prevent possible race in byte queue limits
>>
>>     This change adds a memory barrier to the byte queue limit code to address a
>>     possible race as has been seen in the past with the
>>     netif_stop_queue/netif_wake_queue logic.
>>
>>     Signed-off-by: Alexander Duyck<alexander.h.duyck@...el.com>
>>     Tested-by: Stephen Ko<stephen.s.ko@...el.com>
>>     Signed-off-by: Jeff Kirsher<jeffrey.t.kirsher@...el.com>
>>
>>
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b37c0fbe3f6dfba1f8ad2aed47fb40578a254635
>>
>>
>> commit 5c4903549c05bbb373479e0ce2992573c120654a
>> Author: Alexander Duyck<alexander.h.duyck@...el.com>
>> Date:   Tue Feb 7 02:29:01 2012 +0000
>>
>>     net: Fix issue with netdev_tx_reset_queue not resetting queue from XOFF state
>>
>>     We are seeing dev_watchdog hangs on several drivers.  I suspect this is due
>>     to the __QUEUE_STATE_STACK_XOFF bit being set prior to a reset for link
>>     change, and then not being cleared by netdev_tx_reset_queue.  This change
>>     corrects that.
>>
>>     In addition we were seeing dev_watchdog hangs on igb after running the
>>     ethtool tests.  We found this to be due to the fact that the ethtool test
>>     runs the same logic as ndo_start_xmit, but we were never clearing the XOFF
>>     flag since the loopback test in ethtool does not do byte queue accounting.
>>
>>     Signed-off-by: Alexander Duyck<alexander.h.duyck@...el.com>
>>     Tested-by: Stephen Ko<stephen.s.ko@...el.com>
>>     Signed-off-by: Jeff Kirsher<jeffrey.t.kirsher@...el.com>
>>
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5c4903549c05bbb373479e0ce2992573c120654a
>>
>>


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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