From: "Dong, Eddie" <eddie.dong@intel.com>
To: Sheng Yang <sheng@linux.intel.com>,
Jeremy Fitzhardinge <jeremy@goop.org>
Cc: xen-devel <xen-devel@lists.xensource.com>,
Ian Campbell <Ian.Campbell@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ian Pratt <Ian.Pratt@eu.citrix.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
Keir Fraser <keir.fraser@eu.citrix.com>,
"Dong, Eddie" <eddie.dong@intel.com>
Subject: RE: [Xen-devel] [PATCH 0/7][v4] PV extension of HVM (Hybrid) for Xen
Date: Tue, 2 Mar 2010 11:20:10 +0800 [thread overview]
Message-ID: <1A42CE6F5F474C41B63392A5F80372B21D43CEF0@shsmsx501.ccr.corp.intel.com> (raw)
In-Reply-To: <201003020926.03512.sheng@linux.intel.com>
>
>> Also, I'd like to see a clearer statement of what you're specifically
>> trying to optimise for here. What is inefficient in an unmodified
>> HVM domain, and how do your patches address these things. What
>> measurements have you made?
>
> The key issue we want to address is the overhead of LAPIC, especially
> EOI and other actions resulted in explicit vmexit. That is the
> overhead we want to eliminate. And evtchn seems like a perfect choice
> to us.
>
That is not complete. Linux timer in HVM is always annoying, and time to time make surprise to endusers. PV timer does help here. Eventchannel is nice to HVM as well.
Thx, Eddie
WARNING: multiple messages have this Message-ID (diff)
From: "Dong, Eddie" <eddie.dong@intel.com>
To: Sheng Yang <sheng@linux.intel.com>,
Jeremy Fitzhardinge <jeremy@goop.org>
Cc: xen-devel <xen-devel@lists.xensource.com>,
Jeremy, Ian Campbell <Ian.Campbell@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
"Dong, Eddie" <eddie.dong@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ian Pratt <Ian.Pratt@eu.citrix.com>,
Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
Keir Fraser <keir.fraser@eu.citrix.com>
Subject: RE: [PATCH 0/7][v4] PV extension of HVM (Hybrid) for Xen
Date: Tue, 2 Mar 2010 11:20:10 +0800 [thread overview]
Message-ID: <1A42CE6F5F474C41B63392A5F80372B21D43CEF0@shsmsx501.ccr.corp.intel.com> (raw)
In-Reply-To: <201003020926.03512.sheng@linux.intel.com>
>
>> Also, I'd like to see a clearer statement of what you're specifically
>> trying to optimise for here. What is inefficient in an unmodified
>> HVM domain, and how do your patches address these things. What
>> measurements have you made?
>
> The key issue we want to address is the overhead of LAPIC, especially
> EOI and other actions resulted in explicit vmexit. That is the
> overhead we want to eliminate. And evtchn seems like a perfect choice
> to us.
>
That is not complete. Linux timer in HVM is always annoying, and time to time make surprise to endusers. PV timer does help here. Eventchannel is nice to HVM as well.
Thx, Eddie
next prev parent reply other threads:[~2010-03-02 3:24 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-01 9:38 [PATCH 0/7][v4] PV extension of HVM (Hybrid) for Xen Sheng Yang
2010-03-01 9:38 ` [PATCH 1/7] xen: add support for hvm_op Sheng Yang
2010-03-01 9:38 ` Sheng Yang
2010-03-01 9:38 ` [PATCH 2/7] xen: Import cpuid.h from Xen Sheng Yang
2010-03-01 9:38 ` [PATCH 3/7] xen/hvm: Xen PV extension of HVM initialization Sheng Yang
2010-03-02 1:02 ` [Xen-devel] " Jeremy Fitzhardinge
2010-03-02 1:02 ` Jeremy Fitzhardinge
2010-03-02 1:38 ` [Xen-devel] " Sheng Yang
2010-03-02 1:38 ` Sheng Yang
2010-03-02 1:43 ` Jeremy Fitzhardinge
2010-03-02 9:22 ` Ian Campbell
2010-03-02 20:17 ` Jeremy Fitzhardinge
2010-03-02 20:17 ` Jeremy Fitzhardinge
2010-03-03 11:35 ` [Xen-devel] " Stefano Stabellini
2010-03-03 11:35 ` Stefano Stabellini
2010-03-03 17:35 ` [Xen-devel] " Jeremy Fitzhardinge
2010-03-03 17:41 ` Stefano Stabellini
2010-03-03 17:41 ` Stefano Stabellini
2010-03-04 10:18 ` [Xen-devel] " Ian Campbell
2010-03-04 10:18 ` Ian Campbell
2010-03-01 9:38 ` [PATCH 4/7] xen: The entrance for PV extension of HVM Sheng Yang
2010-03-02 1:05 ` [Xen-devel] " Jeremy Fitzhardinge
2010-03-02 1:41 ` Sheng Yang
2010-03-01 9:38 ` [PATCH 5/7] xen: Make event channel work with " Sheng Yang
2010-03-01 9:38 ` Sheng Yang
2010-03-02 1:38 ` [Xen-devel] " Jeremy Fitzhardinge
2010-03-02 5:48 ` Sheng Yang
2010-03-03 18:31 ` Jeremy Fitzhardinge
2010-03-04 5:37 ` Sheng Yang
2010-03-04 5:37 ` Sheng Yang
2010-03-04 11:58 ` [Xen-devel] " Stefano Stabellini
2010-03-04 11:58 ` Stefano Stabellini
2010-03-08 22:31 ` [Xen-devel] " Jeremy Fitzhardinge
2010-03-08 22:31 ` Jeremy Fitzhardinge
2010-03-01 9:38 ` [PATCH 6/7] xen: Unified checking for Xen of PV drivers to xenbus_register_frontend() Sheng Yang
2010-03-02 1:45 ` [Xen-devel] " Jeremy Fitzhardinge
2010-03-01 9:38 ` [PATCH 7/7] xen: Enable grant table and xenbus for PV extension of HVM Sheng Yang
2010-03-01 17:38 ` [LKML] " Konrad Rzeszutek Wilk
2010-03-01 17:38 ` Konrad Rzeszutek Wilk
2010-03-02 1:13 ` Sheng Yang
2010-03-02 1:13 ` Sheng Yang
2010-03-02 1:21 ` Sheng Yang
2010-03-02 1:21 ` Sheng Yang
2010-03-02 13:41 ` Konrad Rzeszutek Wilk
2010-03-02 14:09 ` Ian Campbell
2010-03-02 14:09 ` Ian Campbell
2010-03-02 0:42 ` [Xen-devel] [PATCH 0/7][v4] PV extension of HVM (Hybrid) for Xen Jeremy Fitzhardinge
2010-03-02 1:26 ` Sheng Yang
2010-03-02 1:32 ` Jeremy Fitzhardinge
2010-03-02 1:32 ` Jeremy Fitzhardinge
2010-03-02 1:34 ` [Xen-devel] " Sheng Yang
2010-03-02 3:20 ` Dong, Eddie [this message]
2010-03-02 3:20 ` Dong, Eddie
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