Re: [Qemu-devel] virtio-console downgrade the virtio-pci-blk performance

2018-10-15 Thread Feng Li
Hi Amit, Thanks for your response. See inline comments. Amit Shah 于2018年10月16日周二 上午2:51写道: > > On (Thu) 11 Oct 2018 [18:15:41], Feng Li wrote: > > Add Amit Shah. > > > > After some tests, we found: > > - the virtio serial port number is inversely proportional to the iSCSI > > virtio-blk-pci per

Re: [Qemu-devel] virtio-console downgrade the virtio-pci-blk performance

2018-10-15 Thread Amit Shah
On (Thu) 11 Oct 2018 [18:15:41], Feng Li wrote: > Add Amit Shah. > > After some tests, we found: > - the virtio serial port number is inversely proportional to the iSCSI > virtio-blk-pci performance. > If we set the virio-serial ports to 2(" type='virtio-serial' index='0' ports='2'/>), the perform

Re: [Qemu-devel] virtio-console downgrade the virtio-pci-blk performance

2018-10-11 Thread Feng Li
Add Amit Shah. After some tests, we found: - the virtio serial port number is inversely proportional to the iSCSI virtio-blk-pci performance. If we set the virio-serial ports to 2("), the performance downgrade is minimal. - use local disk/ram disk as virtio-blk-pci disk, the performance downgrade

Re: [Qemu-devel] virtio-console downgrade the virtio-pci-blk performance

2018-10-01 Thread Feng Li
Hi Dave, My comments are in-line. Dr. David Alan Gilbert 于2018年10月1日周一 下午7:41写道: > > * Feng Li (lifeng1...@gmail.com) wrote: > > Hi, > > I found an obvious performance downgrade when virtio-console combined > > with virtio-pci-blk. > > > > This phenomenon exists in nearly all Qemu versions and al

Re: [Qemu-devel] virtio-console downgrade the virtio-pci-blk performance

2018-10-01 Thread Dr. David Alan Gilbert
* Feng Li (lifeng1...@gmail.com) wrote: > Hi, > I found an obvious performance downgrade when virtio-console combined > with virtio-pci-blk. > > This phenomenon exists in nearly all Qemu versions and all Linux > (CentOS7, Fedora 28, Ubuntu 18.04) distros. > > This is a disk cmd: > -drive > file=

[Qemu-devel] virtio-console downgrade the virtio-pci-blk performance

2018-09-30 Thread Feng Li
Hi, I found an obvious performance downgrade when virtio-console combined with virtio-pci-blk. This phenomenon exists in nearly all Qemu versions and all Linux (CentOS7, Fedora 28, Ubuntu 18.04) distros. This is a disk cmd: -drive file=iscsi://127.0.0.1:3260/iqn.2016-02.com.test:system:fl-iscsi/