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Subject: Re: Programmatically cache line
From: David Chisnall <theraven@FreeBSD.org>
In-Reply-To: <CAJ-VmomxGJsn8eOtWoqevdW-spUPgcSGKEc7eR4xuXLP-E1XRA@mail.gmail.com>
Date: Mon, 1 Jan 2018 06:52:37 +0000
Cc: Konstantin Belousov <kostikbel@gmail.com>,
 blubee blubeeme <gurenchan@gmail.com>,
 FreeBSD current <freebsd-current@freebsd.org>
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References: <CALM2mEmWYz5nyqvxMJwMWoFOXnDTvWFrEug7UUha6xe7Um6ODw@mail.gmail.com>
 <20171230082812.GL1684@kib.kiev.ua>
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To: Adrian Chadd <adrian.chadd@gmail.com>
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On 1 Jan 2018, at 05:09, Adrian Chadd <adrian.chadd@gmail.com> wrote:
>=20
> On 30 December 2017 at 00:28, Konstantin Belousov =
<kostikbel@gmail.com> wrote:
>> On Sat, Dec 30, 2017 at 07:50:19AM +0000, blubee blubeeme wrote:
>>> Is there some way to programmatically get the CPU cache line sizes =
on
>>> FreeBSD?
>>=20
>> There are, all of them are MD.
>>=20
>> On x86, the CPUID instruction leaf 0x1 returns the information in
>> %ebx register.
>=20
> Hm, weird. Why don't we extend sysctl to include this info?

It would be nice to expose this kind of information via VDSO or similar. =
 There are a lot of similar bits of info that people want to use for =
ifunc and, SVE is going to have a bunch of similar requirements.

David