linux-kernel - Re: system call time increase when turning on CONFIG

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Message-ID: <45EF5F0C.5070102@goop.org>
Date:	Wed, 07 Mar 2007 16:55:40 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	tim.c.chen@...ux.intel.com
CC:	zach@...are.com, linux-kernel@...r.kernel.org,
	Virtualization Mailing List <virtualization@...ts.osdl.org>
Subject: Re: system call time increase when turning on CONFIG_PARAVIRT

Tim Chen wrote:
> It turned out that VDSO was turned off by CONFIG_PARAVIRT option,
> causing the system call to use inefficient int 0x80 which led to the
> increase system_call time I was seeing.  I noted that Ingo has caught
> this problem and proposed a patch to correct this issue in another mail
> thread.

Thanks for identifying this.  We'll be posting a more general fix for
COMPAT_VDSO soon which will address this.

    J
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