linux-kernel - Re: [PATCH v2 2/2] virtio-ring: Allocate indirect buffers from cache when possible

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Date:	Tue, 28 Aug 2012 15:35:00 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	rusty@...tcorp.com.au, virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, avi@...hat.com, kvm@...r.kernel.org
Subject: Re: [PATCH v2 2/2] virtio-ring: Allocate indirect buffers from cache
 when possible

On 08/28/2012 03:20 PM, Michael S. Tsirkin wrote:
> On Tue, Aug 28, 2012 at 03:04:03PM +0200, Sasha Levin wrote:
>> Currently if VIRTIO_RING_F_INDIRECT_DESC is enabled we will
>> use indirect descriptors and allocate them using a simple
>> kmalloc().
>>
>> This patch adds a cache which will allow indirect buffers under
>> a configurable size to be allocated from that cache instead.
>>
>> Signed-off-by: Sasha Levin <levinsasha928@...il.com>
> 
> I imagine this helps performance? Any numbers?

I ran benchmarks on the original RFC, I've re-tested it now and got similar
numbers to the original ones (virtio-net using vhost-net, thresh=16):

Before:
	Recv   Send    Send
	Socket Socket  Message  Elapsed
	Size   Size    Size     Time     Throughput
	bytes  bytes   bytes    secs.    10^6bits/sec

	 87380  16384  16384    10.00    4512.12

After:
	Recv   Send    Send
	Socket Socket  Message  Elapsed
	Size   Size    Size     Time     Throughput
	bytes  bytes   bytes    secs.    10^6bits/sec

	 87380  16384  16384    10.00    5399.18


Thanks,
Sasha
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