From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: [PATCHv3 6/6] evtchn: pad struct evtchn to 64 bytes
Date: Thu, 18 Jun 2015 12:31:31 +0100
Message-ID: <5582C834020000780008694B@mail.emea.novell.com>
References: <1434542583-28073-1-git-send-email-david.vrabel@citrix.com>
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To: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org, Keir Fraser <keir@xen.org>, Ian Campbell <ian.campbell@citrix.com>, Tim Deegan <tim@xen.org>
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>>> On 17.06.15 at 14:03, <david.vrabel@citrix.com> wrote:
> The number of struct evtchn in a page must be a power of two.  Under
> some workloads performance is improved slightly by padding struct
> evtchn to 64 bytes (a typical cache line size), thus putting the fewer
> per-channel locks into each cache line.
> 
> This does not decrease the number of struct evtchn's per-page.
> 
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>

Acked-by: Jan Beulich <jbeulich@suse.com>