[v2] qemu-options: Trivial doc fixes related to -smp

[PATCH v2 2/2] qemu-options: Add missing "sockets=2, maxcpus=2" to CLI "-smp 2"

Posted by Yanan Wang 4 years, 4 months ago

There is one numa config example in qemu-options.hx currently
using "-smp 2" and assuming that there will be 2 sockets and
2 cpus totally. However now the actual calculation logic of
missing sockets and cores is not immutable and is considered
liable to change. Although we will get maxcpus=2 finally based
on current parser, it's always stable to specify it explicitly.

So "-smp 2,sockets=2,maxcpus=2" will be optimal when we expect
multiple sockets and 2 cpus totally.

Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
---
 qemu-options.hx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index dcd9595650..ff8917c5e1 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -395,7 +395,7 @@ SRST
         -m 2G \
         -object memory-backend-ram,size=1G,id=m0 \
         -object memory-backend-ram,size=1G,id=m1 \
-        -smp 2 \
+        -smp 2,sockets=2,maxcpus=2 \
         -numa node,nodeid=0,memdev=m0 \
         -numa node,nodeid=1,memdev=m1,initiator=0 \
         -numa cpu,node-id=0,socket-id=0 \
-- 
2.19.1

Re: [PATCH v2 2/2] qemu-options: Add missing "sockets=2,maxcpus=2" to CLI "-smp 2"

Posted by Andrew Jones 4 years, 4 months ago

On Tue, Sep 28, 2021 at 08:11:34PM +0800, Yanan Wang wrote:
> There is one numa config example in qemu-options.hx currently
> using "-smp 2" and assuming that there will be 2 sockets and
> 2 cpus totally. However now the actual calculation logic of
> missing sockets and cores is not immutable and is considered
> liable to change. Although we will get maxcpus=2 finally based
> on current parser, it's always stable to specify it explicitly.
> 
> So "-smp 2,sockets=2,maxcpus=2" will be optimal when we expect
> multiple sockets and 2 cpus totally.
> 
> Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
> ---
>  qemu-options.hx | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/qemu-options.hx b/qemu-options.hx
> index dcd9595650..ff8917c5e1 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -395,7 +395,7 @@ SRST
>          -m 2G \
>          -object memory-backend-ram,size=1G,id=m0 \
>          -object memory-backend-ram,size=1G,id=m1 \
> -        -smp 2 \
> +        -smp 2,sockets=2,maxcpus=2 \
>          -numa node,nodeid=0,memdev=m0 \
>          -numa node,nodeid=1,memdev=m1,initiator=0 \
>          -numa cpu,node-id=0,socket-id=0 \
> -- 
> 2.19.1
>

Reviewed-by: Andrew Jones <drjones@redhat.com>

Re: [PATCH v2 2/2] qemu-options: Add missing "sockets=2, maxcpus=2" to CLI "-smp 2"

Posted by Laurent Vivier 4 years, 4 months ago

Le 28/09/2021 à 14:11, Yanan Wang a écrit :
> There is one numa config example in qemu-options.hx currently
> using "-smp 2" and assuming that there will be 2 sockets and
> 2 cpus totally. However now the actual calculation logic of
> missing sockets and cores is not immutable and is considered
> liable to change. Although we will get maxcpus=2 finally based
> on current parser, it's always stable to specify it explicitly.
> 
> So "-smp 2,sockets=2,maxcpus=2" will be optimal when we expect
> multiple sockets and 2 cpus totally.
> 
> Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
> ---
>  qemu-options.hx | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/qemu-options.hx b/qemu-options.hx
> index dcd9595650..ff8917c5e1 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -395,7 +395,7 @@ SRST
>          -m 2G \
>          -object memory-backend-ram,size=1G,id=m0 \
>          -object memory-backend-ram,size=1G,id=m1 \
> -        -smp 2 \
> +        -smp 2,sockets=2,maxcpus=2 \
>          -numa node,nodeid=0,memdev=m0 \
>          -numa node,nodeid=1,memdev=m1,initiator=0 \
>          -numa cpu,node-id=0,socket-id=0 \
> 

Applied to my trivial-patches branch.

Thanks,
Laurent

Re: [PATCH v2 2/2] qemu-options: Add missing "sockets=2,maxcpus=2" to CLI "-smp 2"

Posted by Daniel P. Berrangé 4 years, 4 months ago

On Tue, Sep 28, 2021 at 08:11:34PM +0800, Yanan Wang wrote:
> There is one numa config example in qemu-options.hx currently
> using "-smp 2" and assuming that there will be 2 sockets and
> 2 cpus totally. However now the actual calculation logic of
> missing sockets and cores is not immutable and is considered
> liable to change. Although we will get maxcpus=2 finally based
> on current parser, it's always stable to specify it explicitly.
> 
> So "-smp 2,sockets=2,maxcpus=2" will be optimal when we expect
> multiple sockets and 2 cpus totally.
> 
> Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
> ---
>  qemu-options.hx | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


Regards,
Daniel
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