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[Qemu-devel] How to send memory info
From: |
Linhaifeng |
Subject: |
[Qemu-devel] How to send memory info |
Date: |
Thu, 11 Dec 2014 11:10:55 +0800 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.1.0 |
Hi,all
Yestoday i tested the set_mem_table message found that qemu not send all the
memory info(fd and size) when
VM memory size is 2G and have two numa nodes(two hugepage files).If VM memory
size is 4G and have two numa nodes
will send all the memory info.
Here is my understand,is this right?
If qemu not send all the memory infomation about hugepage files,vhost-user
couldn't map all the VM memory.
If vhost-user couldn't map all the VM memory vhost-user maybe couldn't read the
packets which allocate by Guest.
1.Information about VM who has 2G and two numa nodes(vhost-user couldn't read
the packets from tx_ring of Guest):
xml:
<cpu>
<numa>
<cell id='0' cpus='0' memory='1048576' memAccess='shared'/>
<cell id='1' cpus='1' memory='1048576' memAccess='shared'/>
</numa>
</cpu>
<memoryBacking>
<hugepages>
<page size="2" unit="M" nodeset="0,1"/>
</hugepages>
</memoryBacking>
<interface type='vhostuser'>
<mac address='52:54:00:3b:83:1a'/>
<source type='unix' path='/var/run/vhost-user/port1' mode='client'/>
<model type='virtio'/>
</interface>
qemu command:
-m 2048 -smp 2,sockets=2,cores=1,threads=1
-object
memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=on,size=1024M,id=ram-node0
-numa node,nodeid=0,cpus=0,memdev=ram-node0
-object
memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=on,size=1024M,id=ram-node1
-numa node,nodeid=1,cpus=1,memdev=ram-node1
memory regions:
gpa = 0xC0000
size = 2146697216
ua = 0x2aaaaacc0000
offset = 786432
gpa = 0x0
size = 655360
ua = 0x2aaaaac00000
offset = 0
hugepage:
cat /proc/pidof qemu/maps
2aaaaac00000-2aaaeac00000 rw-s 00000000 00:18 10357788
/dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node0.MvcPyi (deleted)
2aaaeac00000-2aab2ac00000 rw-s 00000000 00:18 10357789
/dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node1.tjAVin (deleted)
The memory size of each region is not match to the size of each hugepage
file,is this ok?How does vhost-user to mmap all the hugepage?
2.Information about VM who has 4G and two numa nodes(vhost-user could read the
packets from tx_ring of Guest):
xml:
<cpu>
<numa>
<cell id='0' cpus='0' memory='2097152' memAccess='shared'/>
<cell id='1' cpus='1' memory='2097152' memAccess='shared'/>
</numa>
</cpu>
<memoryBacking>
<hugepages>
<page size="2" unit="M" nodeset="0,1"/>
</hugepages>
</memoryBacking>
qemu command:
-m 4096 -smp 2,sockets=2,cores=1,threads=1
-object
memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=on,size=2048M,id=ram-node0
-numa node,nodeid=0,cpus=0,memdev=ram-node0
-object
memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=on,size=2048M,id=ram-node1
-numa node,nodeid=1,cpus=1,memdev=ram-node1
memory regions:
gpa = 0xC0000
size = 3220439040
ua = 0x2aaaaacc0000
offset = 786432
gpa = 0x100000000
size = 1073741824
ua = 0x2aab6ac00000
offset = 1073741824
gpa = 0x0
size = 655360
ua = 0x2aaaaac00000
offset = 0
hugepage:
cat /proc/pidof qemu/maps
2aaaaac00000-2aab2ac00000 rw-s 00000000 00:18 10756623
/dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node0.If4Qkf (deleted)
2aab2ac00000-2aabaac00000 rw-s 00000000 00:18 10756624
/dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node1.jQZPcI (deleted)
--
Regards,
Haifeng
- [Qemu-devel] How to send memory info,
Linhaifeng <=