From: Dario Faggioli <dario.faggioli@citrix.com>
To: konrad.wilk@oracle.com
Cc: artem.mygaiev@globallogic.com, msw@amazon.com,
Ian.Jackson@eu.citrix.com, dongxiao.xu@intel.com,
mengxu@cis.upenn.edu, feng.wu@intel.com,
zhigang.x.wang@oracle.com, parth.dixit@linaro.org,
Paul.Skentzos@dornerworks.com, wency@cn.fujitsu.com,
rcojocaru@bitdefender.com, guijianfeng@cn.fujitsu.com,
Vijaya.Kumar@caviumnetworks.com, josh.whitehead@dornerworks.com,
zoltan.kiss@citrix.com, avanzini.arianna@gmail.com,
yang.z.zhang@intel.com, xen-devel@lists.xenproject.org,
serge.broslavsky@linaro.org, yjhyun.yoo@samsung.com,
olaf@aepfle.de, ian.campbell@citrix.com, vijay.kilari@gmail.com,
stefano.stabellini@eu.citrix.com, mcgrof@suse.com,
julien.grall@linaro.org, dave.scott@citrix.com,
robert.vanvossen@dornerworks.com, shantong.kang@intel.com,
roy.franz@linaro.org, anthony.perard@citrix.com,
andrew.cooper3@citrix.com, ufimtseva@gmail.com, bjzhang@suse.com,
eddie.d.ong@intel.co
Subject: Re: Xen 4.5 development update (July update)
Date: Tue, 19 Aug 2014 18:46:51 +0200 [thread overview]
Message-ID: <1408466811.3725.62.camel@Solace.lan> (raw)
In-Reply-To: <20140815172302.2A9FEC33B7@laptop.dumpdata.com>
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On ven, 2014-08-15 at 13:23 -0400, konrad.wilk@oracle.com wrote:
> = Open =
> == x86 ==
> * HT enabled, virtualization overhead is high (Xen 4.4) (none)
> kernbench demonstrated it
> Looking and tracing
> http://www.gossamer-threads.com/lists/xen/devel/339409
> - Dario Faggioli
>
Mmm... I realize only now that I must have missed your last email about
this... So, sorry.
In any case, didn't we settle on closing it? The bullet is here because
very high perf degradation between baremetal and HVM DomU was seen when
running `kernbench -j' (i.e., kernbench with unlimited number of build
jobs) with HT enabled.
Both me and other people tried to reproduce the issue, and here's the
number:
HT Enabled
==========
Host Guest
kernbench -j4 31.598 (0.113666) 34.078 (0.168582)
kernbench -j8 26.676 (0.16772) 26.672 (0.0432435)
kernbench -j 27.674 (0.933584) 27.49 (0.364897)
To me, this means we don't have an issue of high virtualization overhead
when HT is enabled (look at the last row!).
All the other things that came up in previous threads are not to be
ignored or forgot, of course, and I won't, but they don't have anything
to do with this.
Let me know,
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
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next prev parent reply other threads:[~2014-08-19 16:47 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-15 17:23 Xen 4.5 development update (July update) konrad.wilk
2014-08-15 17:58 ` Don Slutz
2014-08-15 19:40 ` Jan Beulich
2014-08-15 19:46 ` Konrad Rzeszutek Wilk
2014-08-15 21:19 ` Jan Beulich
2014-08-16 0:31 ` Meng Xu
2014-08-20 9:53 ` Dario Faggioli
2014-08-20 13:40 ` Meng Xu
2014-08-19 16:46 ` Dario Faggioli [this message]
2014-08-21 19:17 ` Konrad Rzeszutek Wilk
-- strict thread matches above, loose matches on Subject: below --
2014-09-02 20:45 konrad.wilk
2014-09-02 21:25 ` Andrew Cooper
2014-09-03 10:09 ` Ian Campbell
2014-09-03 10:13 ` Wei Liu
2014-09-03 11:27 ` Andrew Cooper
2014-09-03 11:53 ` Shriram Rajagopalan
2014-09-03 11:58 ` Andrew Cooper
2014-09-03 19:54 ` Julien Grall
2014-09-09 14:04 ` Konrad Rzeszutek Wilk
2014-09-03 1:17 ` Hongyang Yang
2014-09-03 12:05 ` Shriram Rajagopalan
2014-09-03 1:23 ` Mukesh Rathor
2014-09-03 12:54 ` Boris Ostrovsky
2014-09-03 15:47 ` Tamas K Lengyel
2014-09-03 15:53 ` Roy Franz
2014-09-09 9:53 ` Ian Campbell
2014-09-09 10:30 ` Jan Beulich
2014-09-09 14:09 ` Konrad Rzeszutek Wilk
2014-09-09 14:30 ` Jan Beulich
2014-09-09 15:48 ` Konrad Rzeszutek Wilk
2014-09-09 14:06 ` Konrad Rzeszutek Wilk
2014-09-09 13:51 ` Meng Xu
2014-09-09 17:02 ` Dario Faggioli
2014-07-23 0:28 konrad.wilk
2014-07-23 0:47 ` Boris Ostrovsky
2014-07-23 16:09 ` Konrad Rzeszutek Wilk
2014-07-23 8:32 ` Andrew Cooper
2014-07-23 9:51 ` Ian Campbell
2014-07-23 10:20 ` Stefano Stabellini
2014-07-23 12:54 ` Don Slutz
2014-07-23 13:03 ` Stefano Stabellini
2014-07-23 18:34 ` Don Slutz
2014-07-24 11:21 ` Stefano Stabellini
2014-07-23 13:42 ` Fabio Fantoni
2014-07-23 13:45 ` Stefano Stabellini
2014-07-23 13:55 ` Fabio Fantoni
2014-07-23 17:02 ` Konrad Rzeszutek Wilk
2014-07-24 11:23 ` Stefano Stabellini
2014-07-25 17:22 ` Konrad Rzeszutek Wilk
2014-07-23 16:18 ` Konrad Rzeszutek Wilk
2014-07-23 16:43 ` Ian Campbell
2014-07-28 17:35 ` Dario Faggioli
2014-08-04 15:44 ` Konrad Rzeszutek Wilk
[not found] ` <1406569210.4038.28.camel@Solace>
[not found] ` <CAENZ-+=pABtLnOU1CE8nHYd48S0_pB4cggLz1zrqQq2V1pcA-w@mail.gmail.com>
2014-07-29 1:37 ` Meng Xu
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