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From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
To: Yoshiaki Tamura <tamura.yoshiaki@lab.ntt.co.jp>
Cc: "ospk-vm@lab.ntt.co.jp" <ospk-vm@lab.ntt.co.jp>,
	Ian Pratt <Ian.Pratt@eu.citrix.com>,
	xen-devel <xen-devel@lists.xensource.com>,
	Ian Jackson <Ian.Jackson@eu.citrix.com>,
	Keir Fraser <Keir.Fraser@eu.citrix.com>
Subject: Re: [RFC][PATCH 12/13] Kemari: use signal to save qemu state for Kemari
Date: Tue, 17 Mar 2009 17:55:37 +0000	[thread overview]
Message-ID: <49BFE419.5080103@eu.citrix.com> (raw)
In-Reply-To: <49B14D4B.7090300@lab.ntt.co.jp>

Yoshiaki Tamura wrote:

> Have you measured, or any thoughts on the latency of xenstore compared to signals?


I did a couple of quick tests and it seems that signals are faster then
xenstore but still xenstore offers good performances.

I measured the time using rdtsc at the sender size and at the receiver
size, the difference between the two values is the following:

signals: 368836

xenstore: 1984632

  reply	other threads:[~2009-03-17 17:55 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-06  5:47 [RFC][PATCH 00/13] Kemari: VM synchronization mechanism for fault tolerance Yoshiaki Tamura
2009-03-06  5:50 ` [RFC][PATCH 01/13] Kemari: add ECS_TAP state to event channel Yoshiaki Tamura
2009-03-06  5:53 ` [RFC][PATCH 02/13] Kemari: core kemari code Yoshiaki Tamura
2009-03-06  5:54 ` [RFC][PATCH 03/13] Kemari: change parameter type of xc_{set, get}_hvm_param Yoshiaki Tamura
2009-03-06  5:56 ` [RFC][PATCH 04/13] Kemari: Kemari controller interface in libxc Yoshiaki Tamura
2009-03-06  6:26 ` [RFC][PATCH 05/13] Kemari: Kemari sender Yoshiaki Tamura
2009-03-06  6:46 ` [RFC][PATCH 06/13] Kemari: Kemari receiver Yoshiaki Tamura
2009-03-06  6:46 ` [RFC][PATCH 07/13] Kemari: add Kemari support to python Yoshiaki Tamura
2009-03-06  6:46 ` [RFC][PATCH 08/13] Kemari: add dev state "Attached" " Yoshiaki Tamura
2009-03-06  6:47 ` [RFC][PATCH 09/13] Kemari: add XenbusStateAttached to xenbus Yoshiaki Tamura
2009-03-06  6:47 ` [RFC][PATCH 10/13] Kemari: XenbusStateAttached handler for blkback Yoshiaki Tamura
2009-03-06  6:47 ` [RFC][PATCH 11/13] Kemari: XenbusStateAttached handler for netback Yoshiaki Tamura
2009-03-06  6:47 ` [RFC][PATCH 12/13] Kemari: use signal to save qemu state for Kemari Yoshiaki Tamura
2009-03-06 11:39   ` Stefano Stabellini
2009-03-06 16:20     ` Yoshiaki Tamura
2009-03-17 17:55       ` Stefano Stabellini [this message]
2009-03-17 18:21         ` Ian Jackson
2009-03-17 18:35           ` Stefano Stabellini
2009-03-18  9:11             ` Yoshiaki Tamura
2009-03-18  9:34               ` Keir Fraser
2009-03-18 12:45                 ` Yoshiaki Tamura
2009-03-18 12:46               ` Stefano Stabellini
2009-03-18 13:06                 ` Keir Fraser
2009-03-19  5:54                   ` Yoshiaki Tamura
2009-03-18 17:37               ` Christopher Head
2009-03-19  6:07                 ` Yoshiaki Tamura
2009-03-16 18:05     ` Ian Jackson
2009-03-06  6:47 ` [RFC][PATCH 13/13] Kemari: use shared region with to flip logdirty_bitmap Yoshiaki Tamura
  -- strict thread matches above, loose matches on Subject: below --
2009-03-12  1:22 [RFC][PATCH 12/13] Kemari: use signal to save qemu state for Kemari Yoshiaki Tamura
2009-03-24  6:59 ` Yoshiaki Tamura

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