From: Andrew Cooper <andrew.cooper3@citrix.com>
To: "Anshul Makkar anshul.makkar"@citrix.com, xen-devel@lists.xen.org
Cc: yang.z.zhang@intel.com, kevin.tian@intel.com,
anshulma <anshul.makkar@citrix.com>,
jbeulich@suse.com
Subject: Re: [PATCH] iommu/quirk: disable shared EPT for Sandybridge and earlier processors.
Date: Fri, 28 Aug 2015 17:24:25 +0100 [thread overview]
Message-ID: <55E08B39.5070300@citrix.com> (raw)
In-Reply-To: <1440776507-30218-1-git-send-email-anshul.makkar@citrix.com>
On 28/08/15 16:41, "Anshul Makkar anshul.makkar"@citrix.com wrote:
> From: anshulma <anshul.makkar@citrix.com>
>
> Sandybridge or earlier processors don't have huge page support for
> IOTLB which leads to fallback on 4k pages and causes performance issues.
>
> Shared EPT will be disabled only if the user has not provided explicit
> choice on the command line.
>
> Signed-off-by: Anshul Makkar <anshul.makkar@citrix.com>
As a note concerning the performance issues, for some IO workloads, this
nets a 40% throughput improvement.
We did not observe any IO workloads which had a worse performance as a
result of disabling shared ept.
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
~Andrew
next parent reply other threads:[~2015-08-28 16:24 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1440776507-30218-1-git-send-email-anshul.makkar@citrix.com>
2015-08-28 16:24 ` Andrew Cooper [this message]
2015-08-31 8:09 ` [PATCH] iommu/quirk: disable shared EPT for Sandybridge and earlier processors Jan Beulich
2015-09-01 14:18 ` Andrew Cooper
2015-09-01 14:55 ` Jan Beulich
2015-11-24 17:17 Anshul
2015-11-24 17:41 ` Jan Beulich
2015-11-25 10:28 ` Andrew Cooper
2015-11-25 10:49 ` Jan Beulich
2015-11-25 15:13 ` Andrew Cooper
2015-11-25 15:38 ` Jan Beulich
2015-11-25 15:58 ` Malcolm Crossley
2015-11-26 7:17 ` Tian, Kevin
2015-12-01 16:45 ` Anshul Makkar
2015-12-01 17:20 ` Jan Beulich
2015-11-26 8:45 ` Jan Beulich
2015-11-26 10:27 ` Andrew Cooper
2015-11-26 10:39 ` Jan Beulich
2015-11-26 11:42 ` Andrew Cooper
2015-11-26 11:53 ` Jan Beulich
2015-11-26 13:46 ` Jan Beulich
2015-11-26 13:48 ` Malcolm Crossley
2015-11-26 13:55 ` Andrew Cooper
2015-11-30 21:22 ` Konrad Rzeszutek Wilk
2015-12-01 10:34 ` Andrew Cooper
2015-12-01 10:44 ` Anshul Makkar
2015-12-01 15:24 ` Konrad Rzeszutek Wilk
2015-12-01 16:19 ` Andrew Cooper
2015-12-03 1:19 ` Tian, Kevin
2015-12-03 11:24 ` Andrew Cooper
2015-12-04 1:55 ` Tian, Kevin
2015-12-03 2:40 ` Tian, Kevin
2015-12-03 8:18 ` Jan Beulich
2015-12-03 8:50 ` Tian, Kevin
2015-12-03 11:19 ` Andrew Cooper
2015-12-04 2:35 ` Tian, Kevin
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