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Re: [Qemu-devel] [PATCH v4 0/3] add avx2 instruction optimization


From: 陈博
Subject: Re: [Qemu-devel] [PATCH v4 0/3] add avx2 instruction optimization
Date: Wed, 20 Jan 2016 18:22:21 +0800

Sorry for disturbing by reply, don't know why I'm not able to send a new mail.
————

Hi folks,

Could you enlighten me how to achieve proportional IO sharing by using cgroup, instead of qemu's io-throttling?

My qemu config is like: -drive file=$DISKFILe,if=none,format=qcow2,cache=none,aio=native -device virtio-blk-pci...

Test command inside vm is like: dd if=/dev/vdc of=/dev/null iflag=direct

Cgroup blkio weight of the qemu process is properly configured as well.

But no matter how change the proportion, such as vm1=400 and vm2=100, I can only get the equal IO speed.

Wondering cgroup blkio.weight or blkio.weight_device has no effect on qemu?


PS. cache=writethrough aio=threads is also tested, the same results. 


- Bob



在 2016年1月20日,下午5:05,Liang Li <address@hidden> 写道:

buffer_find_nonzero_offset() is a hot function during live migration.



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