linux-kernel - Re: [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies

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Date:	Tue, 17 Sep 2013 04:07:23 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	David Miller <davem@...emloft.net>
CC:	greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Alexey.Brodkin@...opsys.com" <Alexey.Brodkin@...opsys.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file
 copies

On 09/17/2013 01:10 AM, greg Kroah-Hartman wrote:
> On Mon, Sep 16, 2013 at 11:13:48AM +0530, Vineet Gupta wrote:
>> On 09/10/2013 11:57 AM, Vineet Gupta wrote:
>>> On 09/05/2013 11:55 PM, David Miller wrote:
>>>> From: Vineet Gupta <Vineet.Gupta1@...opsys.com>
>>>> Date: Wed, 4 Sep 2013 17:17:15 +0530
>>>>
>>>>> copying large files to a NFS mounted host was taking absurdly large
>>>>> time.
>>>>>
>>>>> Turns out that TX BD reclaim had a sublte bug.
>>>>>
>>>>> Loop starts off from @txbd_dirty cursor and stops when it hits a BD
>>>>> still in use by controller. However when it stops it needs to keep the
>>>>> cursor at that very BD to resume scanning in next iteration. However it
>>>>> was erroneously incrementing the cursor, causing the next scan(s) to
>>>>> fail too, unless the BD chain was completely drained out.
>>>>>
>>>>> [ARCLinux]$ ls -l -sh /disk/log.txt
>>>>>  17976 -rw-r--r--    1 root     root       17.5M Sep  /disk/log.txt
>>>>>
>>>>> ========== Before =====================
>>>>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
>>>>> real    31m 7.95s
>>>>> user    0m 0.00s
>>>>> sys     0m 0.10s
>>>>>
>>>>> ========== After =====================
>>>>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
>>>>> real    0m 24.33s
>>>>> user    0m 0.00s
>>>>> sys     0m 0.19s
>>>>>
>>>>> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
>>>> Applied.
>>>>
>>> Hi Greg,
>>>
>>> This needs a stable backport (3.11).
>>> Mainline commit 27082ee1b92f4d41e78b85
>>>
>>> Thx,
>>> -Vineet
>> Hi Greg,
>>
>> I didn't spot this one in your stable-queue for 3.11.
>> Please apply.
> Network patches for the stable tree needs to go through the networking
> maintainer.  Please let them know about this and they will forward it on
> to me if needed.
>
> thanks,
>
> greg k-h

Hi David,

Can you please do the needful for stable 3.11 backport of this patch.

Thx,
-Vineet
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