Hi Pavel,
On 2018年06月06日 13:56, bing.niu wrote:
Then there is the domain XML, for CAT we use this:
<domain>
...
<cputune>
...
<cachetune vcpus='0-3'>
<cache id='0' level='3' type='both' size='3' unit='MiB'/>
<cache id='1' level='3' type='both' size='3' unit='MiB'/>
</cachetune>
...
<cputune>
...
</domain>
so the possible domain XML could look like this:
<domain>
...
<cputune>
...
<memory vcpus='0-3'>
<socket id='0' bandwidth='30'/>
<socket id='1' bandwidth='20'/>
</memory>
...
<cputune>
...
</domain>
Again, the element names 'memory' and 'socket' can be named differently.
socket --> node?
Since the existing virrestrl implementation only care about cache part
during development, So we may need change some names of structure and
functions when enable MBA. How do you think
Pavel
Is that possible to support MBA by extending CAT in domain XML? Since
each <cachetune> will map to one virresctrlalloc structure and create a
rdt_group in resctrl fs. Each rdt_group will have it's own closid. this
work perfect if CAT only available. However, if MBA coming in with CAT
enabled also, ike this.
<domain>
...
<cputune>
...
<cachetune vcpus='0-3'>
<cache id='0' level='3' type='both' size='3' unit='MiB'/>
<cache id='1' level='3' type='both' size='3' unit='MiB'/>
</cachetune>
<memory vcpus='2-3'>
<socket id='0' bandwidth='30'/>
<socket id='1' bandwidth='20'/>
</memory>
...
<cputune>
...
</domain>
we have to make sure those two allocating will not have vcpu overlapped.
like this,
if (virBitmapOverlaps(def->cachetunes[i]->vcpus, vcpus)
|| virBitmapOverlaps(def->memroy->vcpus, vcpus)) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("Overlapping vcpus in cachetunes"));
goto cleanup;
that looks like introducing some dependency between CAT and MBA.
Is that possible we rename cachetune so that handle CAT MBA together one
section?
Thanks a lot
Bing
--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list
--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list
