netdev - Re: [PATCH 00/15] Swap-over-NBD without deadlocking V8

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Message-ID: <CAJd=RBDYMKRVSKVp3dAhTCtu_wNDyayCObVA7q6G=fbkKpmZUw@mail.gmail.com>
Date:	Wed, 8 Feb 2012 20:51:11 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>, Neil Brown <neilb@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 00/15] Swap-over-NBD without deadlocking V8

On Tue, Feb 7, 2012 at 9:27 PM, Mel Gorman <mgorman@...e.de> wrote:
> On Tue, Feb 07, 2012 at 08:45:18PM +0800, Hillf Danton wrote:
>> If it is feasible to bypass hang by tuning min_mem_kbytes,
>
> No. Increasing or descreasing min_free_kbytes changes the timing but it
> will still hang.
>
>> things may
>> become simpler if NICs are also tagged.
>
> That would mean making changes to every driver and they do not necessarily
> know what higher level protocol like TCP they are transmitting. How is
> that simpler? What is the benefit?
>
The benefit is to avoid allocating sock buffer in softirq by recycling,
then the changes in VM core maybe less.

Thanks
Hillf
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