From: Ralf Baechle <ralf@linux-mips.org>
To: naveen yadav <yad.naveen@gmail.com>
Cc: kernelnewbies@nl.linux.org,
linux-arm-kernel@lists.arm.linux.org.uk,
linux-mips@linux-mips.org
Subject: Re: Change of Default kernel page size i.e 4KB
Date: Wed, 1 Dec 2010 13:24:37 +0000 [thread overview]
Message-ID: <20101201132437.GA32555@linux-mips.org> (raw)
In-Reply-To: <AANLkTi=4gtEC9fZyvc9g6uHecvjPrr0dDc==KsDOvq2Q@mail.gmail.com>
On Wed, Dec 01, 2010 at 01:50:13PM +0530, naveen yadav wrote:
> Cc: kernelnewbies@nl.linux.org,
> linux-arm-kernel-request@lists.arm.linux.org.uk,
^^^^^^^^ WTF?
> linux-mips@linux-mips.org
> I have few drivers and very big application running on ARM and MIPS target.
> I want to check the performance by changing the page size ie.
>
> 8K, 16K, 32K etc.
>
> Is it possile, If yes then what all care i need to take .
For MIPS: Rebuild kernel with support for the new kernel size. Few MIPS
cores. Note that the `odd´ page sizes, that those that aren't a power
of 4 are only supported by Cavium while all MIPS III and newer processors
support even `even´ sizes 4KB, 16KB and 64KB.
Aside of rebuilding the kernel you also need a suitable userland; older
versions of binutils will produce binaries that only run
for 4kB page sizes.
For ARM the page size is fixed at 4kB which will simplify your benchmarking
efforts ;)
Performance gains very much depends on the workload but in general larger
sizes are beneficial except maybe for systems with very little memory.
Ralf
WARNING: multiple messages have this Message-ID (diff)
From: ralf@linux-mips.org (Ralf Baechle)
To: linux-arm-kernel@lists.infradead.org
Subject: Change of Default kernel page size i.e 4KB
Date: Wed, 1 Dec 2010 13:24:37 +0000 [thread overview]
Message-ID: <20101201132437.GA32555@linux-mips.org> (raw)
In-Reply-To: <AANLkTi=4gtEC9fZyvc9g6uHecvjPrr0dDc==KsDOvq2Q@mail.gmail.com>
On Wed, Dec 01, 2010 at 01:50:13PM +0530, naveen yadav wrote:
> Cc: kernelnewbies at nl.linux.org,
> linux-arm-kernel-request at lists.arm.linux.org.uk,
^^^^^^^^ WTF?
> linux-mips at linux-mips.org
> I have few drivers and very big application running on ARM and MIPS target.
> I want to check the performance by changing the page size ie.
>
> 8K, 16K, 32K etc.
>
> Is it possile, If yes then what all care i need to take .
For MIPS: Rebuild kernel with support for the new kernel size. Few MIPS
cores. Note that the `odd? page sizes, that those that aren't a power
of 4 are only supported by Cavium while all MIPS III and newer processors
support even `even? sizes 4KB, 16KB and 64KB.
Aside of rebuilding the kernel you also need a suitable userland; older
versions of binutils will produce binaries that only run
for 4kB page sizes.
For ARM the page size is fixed at 4kB which will simplify your benchmarking
efforts ;)
Performance gains very much depends on the workload but in general larger
sizes are beneficial except maybe for systems with very little memory.
Ralf
next prev parent reply other threads:[~2010-12-01 13:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-01 8:20 Change of Default kernel page size i.e 4KB naveen yadav
2010-12-01 13:24 ` Ralf Baechle [this message]
2010-12-01 13:24 ` Ralf Baechle
2010-12-01 16:53 ` naveen yadav
2010-12-02 2:09 ` Daniel Taylor
2010-12-01 16:06 ` Viral Mehta
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