linux-kernel - Re: [PATCH] fdtable: Avoid triggering OOMs from alloc

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Message-ID: <1391554110.10160.3.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 04 Feb 2014 14:48:30 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	netdev@...r.kernel.org, linux-mm@...ck.org,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH] fdtable: Avoid triggering OOMs from alloc_fdmem

On Tue, 2014-02-04 at 10:57 -0800, Eric W. Biederman wrote:

> As I have heard it described one tcp connection per small requestion,
> and someone goofed and started creating new connections when the server
> was bogged down.  But since all of the requests and replies were small I
> don't expect even TCP would allocate more than a 4KiB page in that
> worload.

Right, small writes uses regular skb (no page fragments).

> 
> I had oodles of 4KiB and 8KiB pages.  What size of memory allocation did
> you see failing?  

We got some reports of order-3 allocations failing.


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