From: Jens Axboe <axboe@kernel.dk>
To: Michael Ellerman <mpe@ellerman.id.au>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Nicholas Piggin <npiggin@gmail.com>
Cc: "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: Memory coherency issue with IO thread offloading?
Date: Fri, 24 Mar 2023 18:20:28 -0600 [thread overview]
Message-ID: <6e289a1c-9cb0-6759-1d38-ddf2f5a251f5@kernel.dk> (raw)
In-Reply-To: <87jzz5u1nv.fsf@mpe.ellerman.id.au>
On 3/24/23 6:15 PM, Michael Ellerman wrote:
> Jens Axboe <axboe@kernel.dk> writes:
>> On 3/24/23 1:27?AM, Christophe Leroy wrote:
>>> Le 23/03/2023 ? 19:54, Jens Axboe a ?crit :
>>>> I got a report sent to me from mariadb, in where 5.10.158 works fine and
>>>> 5.10.162 is broken. And in fact, current 6.3-rc also fails the test
>>>> case. Beware that this email is long, as I'm trying to include
>>>> everything that may be relevant...
>>>
>>> Which variant of powerpc ? 32 or 64 bits ? Book3S or BookE ?
>>
>> I knew I'd forget something important... It's power9:
>>
>> processor : 0
>> cpu : POWER9 (architected), altivec supported
>> clock : 2200.000000MHz
>> revision : 2.2 (pvr 004e 1202)
>
> Believe it or not there's still more variables in play, Power9 has two
> different MMUs, and Linux can run on two different hypervisors as well
> as on bare metal P9 :)
Just my luck :-)
>
> Can you paste the last ~10 lines of /proc/cpuinfo, with the "machine",
> "firmware" and "MMU" lines, that should tell us everything we need to
> know.
timebase : 512000000
platform : pSeries
model : IBM pSeries (emulated by qemu)
machine : CHRP IBM pSeries (emulated by qemu)
MMU : Radix
I know it reproduces bare metal as well, but no details on what
that box is. I just know I was able to reproduce it in this vm that
I was able to get my hands on.
--
Jens Axboe
next prev parent reply other threads:[~2023-03-25 0:21 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-23 18:54 Memory coherency issue with IO thread offloading? Jens Axboe
2023-03-24 7:27 ` Christophe Leroy
2023-03-24 12:06 ` Jens Axboe
2023-03-25 0:15 ` Michael Ellerman
2023-03-25 0:20 ` Jens Axboe [this message]
2023-03-25 0:42 ` Michael Ellerman
2023-03-25 1:15 ` Jens Axboe
2023-03-25 1:20 ` Jens Axboe
2023-03-27 4:22 ` Nicholas Piggin
2023-03-27 12:39 ` Jens Axboe
2023-03-27 21:24 ` Jens Axboe
2023-03-28 12:51 ` Michael Ellerman
2023-03-28 16:38 ` Jens Axboe
2023-03-27 13:53 ` Michael Ellerman
2023-03-28 6:20 Daniel Black
2023-03-28 12:10 ` Michael Ellerman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=6e289a1c-9cb0-6759-1d38-ddf2f5a251f5@kernel.dk \
--to=axboe@kernel.dk \
--cc=christophe.leroy@csgroup.eu \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mpe@ellerman.id.au \
--cc=npiggin@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).