From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Paul Mackerras <paulus@ozlabs.org>
Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org
Subject: Re: [RFC PATCH 0/7] Remove 4k subpage tracking with hash 64K config
Date: Tue, 03 Nov 2015 16:30:21 +1100 [thread overview]
Message-ID: <1446528621.17404.33.camel@kernel.crashing.org> (raw)
In-Reply-To: <87r3k7u0tf.fsf@linux.vnet.ibm.com>
On Tue, 2015-11-03 at 10:38 +0530, Aneesh Kumar K.V wrote:
> I also ran mmtest configs/config-global-dhp__pagealloc-performance
> config with changes including this series. (ie, the changes tested
> include two patch series, one which change the pte format and this
> series). I am attaching the results below. I removed the pagealloc
> performance numbers from that because it was giving me all 00 which I
> assume is due to systemtap script issue.
>
> We don't see any performance impact with the series and some of the
> performance change is withing the variance of test run as indicated by
> the numbers below. We do find less page fault and in some case better
> autonuma numbers
Did you try under pHyp (ie. hit all those H_READ ?).
The easy way to do that is comment out 64K support in htab init to
force 4k demotion allways.
That would give you an idea of the impact on things like old P4/P5
Cheers,
Ben.
next prev parent reply other threads:[~2015-11-03 5:30 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-20 20:12 [RFC PATCH 0/7] Remove 4k subpage tracking with hash 64K config Aneesh Kumar K.V
2015-10-20 20:12 ` [RFC PATCH 1/7] powerpc/mm: Don't hardcode page table size Aneesh Kumar K.V
2015-10-20 20:12 ` [RFC PATCH 2/7] powerpc/mm: Don't hardcode the hash pte slot shift Aneesh Kumar K.V
2015-10-20 20:12 ` [RFC PATCH 3/7] powerpc/nohash: Update 64K nohash config to have 32 pte fragement Aneesh Kumar K.V
2015-10-20 20:12 ` [RFC PATCH 4/7] powerpc/mm: Don't track 4k subpage information with 64k linux page size Aneesh Kumar K.V
2015-10-20 20:12 ` [RFC PATCH 5/7] powerpc/mm: update frag size Aneesh Kumar K.V
2015-10-20 20:12 ` [RFC PATCH 6/7] powerpc/mm: Update pte_iterate_hashed_subpaes args Aneesh Kumar K.V
2015-10-20 20:12 ` [RFC PATCH 7/7] powerpc/mm: getrid of real_pte_t Aneesh Kumar K.V
2015-10-29 3:00 ` [RFC PATCH 0/7] Remove 4k subpage tracking with hash 64K config Paul Mackerras
2015-11-03 5:08 ` Aneesh Kumar K.V
2015-11-03 5:30 ` Benjamin Herrenschmidt [this message]
2015-11-03 9:18 ` Michael Ellerman
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