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Re: [Qemu-devel] vhost-user:How to send memory info
From: |
Linhaifeng |
Subject: |
Re: [Qemu-devel] vhost-user:How to send memory info |
Date: |
Fri, 12 Dec 2014 12:45:23 +0800 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.1.0 |
here is qemu's log :
file_ram_alloc
filename[/dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node0.okpjmP]
fd[7] size[1073741824]
file_ram_alloc
filename[/dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node1.3b43YF]
fd[8] size[1073741824]
region fd[7]:
gpa = 0xC0000
size = 2146697216
ua = 0x2aaaaacc0000
offset = 786432
region fd[7]:
gpa = 0x0
size = 655360
ua = 0x2aaaaac00000
offset = 0
we can see memory region only contain one hugepage.Is this a bug?
On 2014/12/11 11:10, Linhaifeng wrote:
> 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