netdev - Re: [PATCH] flow_cache_flush soft lockup with heavy ipsec traffic

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Date:	Wed, 09 Nov 2011 16:41:04 +0200
From:	Maris Paupe <marisp@...lv>
To:	Steffen Klassert <steffen.klassert@...unet.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH]  flow_cache_flush soft lockup with heavy ipsec traffic

I think i found the correct fix for my problem here 
http://patchwork.ozlabs.org/patch/114330/
The scenario sounds the same, i will test it, thanks.


On 11/09/11 15:43, Steffen Klassert wrote:
> On Wed, Nov 09, 2011 at 02:16:04PM +0100, Eric Dumazet wrote:
>>
>> Sorry, I dont understand your patch.
>>
>> BH are disabled by the spin_lock_bh() call.
>>
>> Once flow_cache_entry are in garbage list, nothing but garbage collector
>> can access them. I see no possible deadlock. Or there is a bug somewhere
>> and your patch avoid it.
>>
>> Whole point of using a work queue to perform garbage collect was to not
>> hold BH too long (allowing sotirq to process incoming packets), so you
>> basically remove what was done in commit 8e4795605d.
>>
>
> I guess this tries to address a problem that was already discussed here:
>
> http://patchwork.ozlabs.org/patch/116457/
>
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