From: Cornelia Huck <cohuck@redhat.com>
To: Yanan Wang <wangyanan55@huawei.com>, qemu-devel@nongnu.org
Cc: "Peter Maydell" <peter.maydell@linaro.org>,
"Andrew Jones" <drjones@redhat.com>,
"Daniel P . Berrangé" <berrange@redhat.com>,
"Eduardo Habkost" <ehabkost@redhat.com>,
"Pierre Morel" <pmorel@linux.ibm.com>,
"Michael S . Tsirkin" <mst@redhat.com>,
"Pankaj Gupta" <pankaj.gupta.linux@gmail.com>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Greg Kurz" <groug@kaod.org>, "Halil Pasic" <pasic@linux.ibm.com>,
wanghaibin.wang@huawei.com, "Thomas Huth" <thuth@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Yanan Wang" <wangyanan55@huawei.com>,
"David Gibson" <david@gibson.dropbear.id.au>
Subject: Re: [PATCH for-6.2 v3 06/11] machine: Prefer cores over sockets in smp parsing since 6.2
Date: Thu, 29 Jul 2021 11:12:05 +0200 [thread overview]
Message-ID: <87pmv132my.fsf@redhat.com> (raw)
In-Reply-To: <20210728034848.75228-7-wangyanan55@huawei.com>
On Wed, Jul 28 2021, Yanan Wang <wangyanan55@huawei.com> wrote:
> In the real SMP hardware topology world, it's much more likely that
> we have high cores-per-socket counts and few sockets totally. While
> the current preference of sockets over cores in smp parsing results
> in a virtual cpu topology with low cores-per-sockets counts and a
> large number of sockets, which is just contrary to the real world.
>
> Given that it is better to make the virtual cpu topology be more
> reflective of the real world and also for the sake of compatibility,
> we start to prefer cores over sockets over threads in smp parsing
> since machine type 6.2 for different arches.
>
> In this patch, a boolean "smp_prefer_sockets" is added, and we only
> enable the old preference on older machines and enable the new one
> since type 6.2 for all arches by using the machine compat mechanism.
>
> Acked-by: David Gibson <david@gibson.dropbear.id.au>
> Suggested-by: Daniel P. Berrange <berrange@redhat.com>
> Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
> ---
> hw/arm/virt.c | 1 +
> hw/core/machine.c | 36 ++++++++++++++++++++++++++----------
> hw/i386/pc.c | 36 ++++++++++++++++++++++++++----------
> hw/i386/pc_piix.c | 1 +
> hw/i386/pc_q35.c | 1 +
> hw/ppc/spapr.c | 1 +
> hw/s390x/s390-virtio-ccw.c | 1 +
> include/hw/boards.h | 1 +
> qemu-options.hx | 3 ++-
> 9 files changed, 60 insertions(+), 21 deletions(-)
Acked-by: Cornelia Huck <cohuck@redhat.com>
next prev parent reply other threads:[~2021-07-29 9:13 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-28 3:48 [PATCH for-6.2 v3 00/11] machine: smp parsing fixes and improvement Yanan Wang
2021-07-28 3:48 ` [PATCH for-6.2 v3 01/11] machine: Minor refactor/cleanup for the smp parsers Yanan Wang
2021-07-28 20:16 ` Andrew Jones
2021-07-29 6:24 ` wangyanan (Y)
2021-07-28 3:48 ` [PATCH for-6.2 v3 02/11] machine: Uniformly use maxcpus to calculate the omitted parameters Yanan Wang
2021-07-28 3:48 ` [PATCH for-6.2 v3 03/11] machine: Set the value of cpus to match maxcpus if it's omitted Yanan Wang
2021-07-28 20:22 ` Andrew Jones
2021-07-29 6:30 ` wangyanan (Y)
2021-07-28 3:48 ` [PATCH for-6.2 v3 04/11] machine: Improve the error reporting of smp parsing Yanan Wang
2021-07-28 20:24 ` Andrew Jones
2021-07-28 3:48 ` [PATCH for-6.2 v3 05/11] hw: Add compat machines for 6.2 Yanan Wang
2021-07-28 3:48 ` [PATCH for-6.2 v3 06/11] machine: Prefer cores over sockets in smp parsing since 6.2 Yanan Wang
2021-07-28 20:28 ` Andrew Jones
2021-07-29 9:12 ` Cornelia Huck [this message]
2021-07-28 3:48 ` [PATCH for-6.2 v3 07/11] machine: Use ms instead of global current_machine in sanity-check Yanan Wang
2021-07-28 4:37 ` Pankaj Gupta
2021-07-29 9:12 ` Cornelia Huck
2021-07-28 3:48 ` [PATCH for-6.2 v3 08/11] machine: Tweak the order of topology members in struct CpuTopology Yanan Wang
2021-07-28 3:48 ` [PATCH for-6.2 v3 09/11] machine: Make smp_parse generic enough for all arches Yanan Wang
2021-07-28 20:38 ` Andrew Jones
2021-07-28 20:41 ` Andrew Jones
2021-07-28 3:48 ` [PATCH for-6.2 v3 10/11] machine: Remove smp_parse callback from MachineClass Yanan Wang
2021-07-28 20:39 ` Andrew Jones
2021-07-28 3:48 ` [PATCH for-6.2 v3 11/11] machine: Move smp_prefer_sockets to struct SMPCompatProps Yanan Wang
2021-07-28 5:09 ` David Gibson
2021-07-28 20:40 ` Andrew Jones
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=87pmv132my.fsf@redhat.com \
--to=cohuck@redhat.com \
--cc=berrange@redhat.com \
--cc=david@gibson.dropbear.id.au \
--cc=drjones@redhat.com \
--cc=ehabkost@redhat.com \
--cc=groug@kaod.org \
--cc=mst@redhat.com \
--cc=pankaj.gupta.linux@gmail.com \
--cc=pasic@linux.ibm.com \
--cc=pbonzini@redhat.com \
--cc=peter.maydell@linaro.org \
--cc=pmorel@linux.ibm.com \
--cc=qemu-devel@nongnu.org \
--cc=richard.henderson@linaro.org \
--cc=thuth@redhat.com \
--cc=wanghaibin.wang@huawei.com \
--cc=wangyanan55@huawei.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).