From: David Daney <ddaney.cavm@gmail.com>
To: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Joshua Kinard <kumba@gentoo.org>,
Ralf Baechle <ralf@linux-mips.org>,
linux-mips@linux-mips.org
Subject: Re: THP broken on OCTEON?
Date: Tue, 24 May 2016 15:39:31 -0700 [thread overview]
Message-ID: <5744D823.2060001@gmail.com> (raw)
In-Reply-To: <20160524212139.GC1253@raspberrypi.musicnaut.iki.fi>
On 05/24/2016 02:21 PM, Aaro Koskinen wrote:
> Hi,
>
> On Mon, May 23, 2016 at 03:40:36PM -0400, Joshua Kinard wrote:
>> Might try some of those combinations and see if things improve on the Octeon?
>> IP27 was equally affected by this, minus the bits about RAM and Impact Gfx.
>> turning off THP, IP30 can run 64KB PAGE_SIZE without issue (compiles of
>> packages is actually sped up quite significantly under >4KB PAGE_SIZE).
>
> I think with 64KB page size, huge pages (512MB) are never allocated
> unless you have insane amounts of memory?
Yes, you need a lot of memory, but more importantly the replacement of
pages with a THP cannot happen unless there are 512MB aligned chunks of
VMAs, and that is rare.
> I tried today some builds
> with 64KB pages on 4GB system and it was stable, but also AnonHugePages
> stayed constantly at zero. But with 4KB pages it is frequently changing,
> and crashes in minutes.
>
> A.
>
>
>
next prev parent reply other threads:[~2016-05-24 22:39 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-23 15:13 THP broken on OCTEON? Aaro Koskinen
2016-05-23 15:20 ` Ralf Baechle
2016-05-23 16:21 ` David Daney
2016-05-23 18:52 ` Aaro Koskinen
2016-05-23 19:03 ` David Daney
2016-05-23 19:03 ` David Daney
2016-05-23 19:08 ` Joshua Kinard
2016-05-23 20:02 ` Alastair Bridgewater
2016-05-23 18:57 ` Joshua Kinard
2016-05-23 19:22 ` Ralf Baechle
2016-05-23 19:40 ` Joshua Kinard
2016-05-23 20:01 ` Ralf Baechle
2016-05-24 21:21 ` Aaro Koskinen
2016-05-24 22:39 ` David Daney [this message]
2016-05-25 13:41 ` Aaro Koskinen
2016-05-26 9:33 ` Joshua Kinard
2016-05-26 13:36 ` Aaro Koskinen
2016-05-26 17:59 ` David Daney
2016-05-26 19:23 ` Aaro Koskinen
2016-05-26 22:13 ` David Daney
2016-05-27 17:14 ` Aaro Koskinen
2016-05-27 21:03 ` Joshua Kinard
2016-05-27 22:05 ` Aaro Koskinen
2016-05-27 22:22 ` Joshua Kinard
2016-06-22 22:05 ` David Daney
2016-06-23 12:08 ` Aaro Koskinen
2016-06-23 12:08 ` Aaro Koskinen
2016-06-24 11:38 ` Joshua Kinard
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