netdev - Re: [Xen-devel] [PATCH v2 net-next 5/7] xen-netback: process guest rx packets in batches

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Message-ID: <f26482a6-5f6f-126e-ae72-6dfcbbafd58c@citrix.com>
Date:   Tue, 4 Oct 2016 15:51:04 +0100
From:   David Vrabel <david.vrabel@...rix.com>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paul Durrant <paul.durrant@...rix.com>
CC:     <netdev@...r.kernel.org>, Wei Liu <wei.liu2@...rix.com>,
        David Vrabel <david.vrabel@...rix.com>,
        <xen-devel@...ts.xenproject.org>
Subject: Re: [Xen-devel] [PATCH v2 net-next 5/7] xen-netback: process guest rx
 packets in batches

On 04/10/16 13:47, Konrad Rzeszutek Wilk wrote:
> On Tue, Oct 04, 2016 at 10:29:16AM +0100, Paul Durrant wrote:
>> From: David Vrabel <david.vrabel@...rix.com>
>>
>> Instead of only placing one skb on the guest rx ring at a time, process
>> a batch of up-to 64.  This improves performance by ~10% in some tests.
> 
> And does it regress latency workloads?

No. Because the loop outside of these batches is only checking for a
fatal error condition or a disconnection.

> What are those 'some tests' you speak off?

I think it was aggregate intrahost, but I don't remember exactly.

David