netdev - Re: [PATCH] vhost-net: fall back to vmalloc if high-order allocation fails

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Date:	Fri, 28 Jun 2013 09:16:59 +0200
From:	Romain Francoise <romain@...bokech.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	kvm@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vhost-net: fall back to vmalloc if high-order allocation fails

"Michael S. Tsirkin" <mst@...hat.com> writes:

> On Wed, Jan 23, 2013 at 09:46:47PM +0100, Romain Francoise wrote:
>> Creating a vhost-net device allocates an object large enough (34320 bytes
>> on x86-64) to trigger an order-4 allocation, which may fail if memory if
>> fragmented:
>> 
>>  libvirtd: page allocation failure: order:4, mode:0x2000d0
>>  ...
>>  SLAB: Unable to allocate memory on node 0 (gfp=0xd0)
>>    cache: size-65536, object size: 65536, order: 4
>>    node 0: slabs: 8/8, objs: 8/8, free: 0
>> 
>> In that situation, rather than forcing the caller to use regular
>> virtio-net, try to allocate the descriptor with vmalloc().
>> 
>> Signed-off-by: Romain Francoise <romain@...bokech.com>

> Thanks for the patch.
> Hmm, I haven't seen this.
> Maybe we should try and reduce our memory usage,
> I will look into this.

Did you get a chance to investigate this? I'm still getting the same
allocation failures with v3.10-rc7 after reverting my local patch.

Thanks.
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