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From: Michael Neuling <mikey@neuling.org>
To: Denis Kirjanov <kda@linux-powerpc.org>
Cc: Michael Ellerman <michael@ellerman.id.au>,
	benh <benh@kernel.crashing.org>,
	 Aaron Sawdey <sawdey@us.ibm.com>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	Anton Blanchard <anton@samba.org>,
	Steve Munroe <sjmunroe@us.ibm.com>
Subject: Re: [PATCH] powerpc/vdso: Avoid link stack corruption in __get_datapage()
Date: Thu, 24 Sep 2015 09:33:05 +1000	[thread overview]
Message-ID: <1443051185.2492.10.camel@neuling.org> (raw)
In-Reply-To: <CAOJe8K3x56V1PNjo=TNMthqbPV1q_tKNBK6QvT=yCofR=qyt3g@mail.gmail.com>


> I've got the following results on POWER7 64bit
> without the patch:
> # ./tb
> time =3D 0.263337
> # ./tb
> time =3D 0.251273
> # ./tb
> time =3D 0.258453
> # ./tb
> time =3D 0.260189
>=20
> with the patch:
> # ./tb
> time =3D 0.241517
> # ./tb
> time =3D 0.241973
> # ./tb
> time =3D 0.239365
> # ./tb
> time =3D 0.240109

Nice, I was expecting a bump there too but didn't test..  Looks like
about 7% to me. =20

Thanks,
Mikey

  parent reply	other threads:[~2015-09-23 23:33 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-23  6:05 [PATCH] powerpc/vdso: Avoid link stack corruption in __get_datapage() Michael Neuling
2015-09-23 18:21 ` Denis Kirjanov
2015-09-23 18:35   ` Aaron Sawdey
     [not found]   ` <201509231835.t8NIZr0Q029029@d01av04.pok.ibm.com>
2015-09-23 23:28     ` Michael Neuling
2015-09-23 23:33   ` Michael Neuling [this message]
2015-09-23 22:23 ` Michael Ellerman
2015-09-24 10:10   ` Denis Kirjanov
2015-09-25  0:05     ` Michael Ellerman

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