linux-kernel - Re: Performance overhead of paravirt

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Message-ID: <4A1629BA.9070309@goop.org>
Date:	Thu, 21 May 2009 21:27:38 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Xin, Xiaohui" <xiaohui.xin@...el.com>
CC:	Chuck Ebbert <cebbert@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"Li, Xin" <xin.li@...el.com>,
	"Nakajima, Jun" <jun.nakajima@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: Performance overhead of paravirt_ops on native identified

Xin, Xiaohui wrote:
> Remember we have done one experiment with "jump", the result shows seems the overhead is even more than the call.
>   

I don't think you had mentioned that. You're saying that a
call->jmp->ret is slower than call->call->ret->ret?

J
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