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From: Christian Hildner <christian.hildner@hob.de>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] VHPT performance
Date: Fri, 22 Feb 2002 11:35:51 +0000	[thread overview]
Message-ID: <marc-linux-ia64-105590701905166@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590701905139@msgid-missing>


David Mosberger schrieb:

> >>>>> On Wed, 20 Feb 2002 13:21:22 +0100, Christian Hildner <christian.hildner@hob.de> said:
>
>   Christian> Hi!  Does anybody have a benchmarking tool or test
>   Christian> program for performance comparisons on the VHPT feature?
>   Christian> Or are there applications that heavily use many different
>   Christian> memory pages?
>
> There certainly are!  The SPEC CPU benchmarks are quite memory intensive, for
> example.
>

I made some measures and found that on Itanium it takes about ~700 CPU cycles to load a single
byte when TLB is missing and VHPT is enabled vs. ~900 cycles with VHPT disabled and handling the
TLB miss in the IVT. Does anybody know if the VHPT walker is implemented in hardware (probably
not), microcode (that's what I think) or unimplemented at all?

Christian



  parent reply	other threads:[~2002-02-22 11:35 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-02-20 12:21 [Linux-ia64] VHPT performance Christian Hildner
2002-02-20 17:02 ` Michael Madore
2002-02-20 17:34 ` David Mosberger
2002-02-22 11:35 ` Christian Hildner [this message]
2002-02-22 16:58 ` David Mosberger
2002-02-28  8:06 ` Christian Hildner
2002-03-01  2:32 ` David Mosberger
2002-03-08  7:50 ` Christian Hildner
2002-03-08  8:12 ` David Mosberger
2002-03-08 10:26 ` Christian Hildner
2002-03-08 17:31 ` David Mosberger

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