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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <87k3leemc4.fsf@kima.orebokech.com>
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.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html