* [Qemu-devel] trim in windows guest witch virtio
@ 2013-07-23 1:05 Libaiqing
2013-07-23 6:34 ` Paolo Bonzini
0 siblings, 1 reply; 6+ messages in thread
From: Libaiqing @ 2013-07-23 1:05 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel@nongnu.org
Hi paolo,
Recently I test trim function,and it works well in linux guest with ext4 fs.
How to test it in windows guest? I got some info like this:
1 windows7 can send discard command when the storage device is ssd;
2 find a tool like 'fstrim', 'TRIM' the volume manually.
What's your opinion about this.
Thanks
Baiqing.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Qemu-devel] trim in windows guest witch virtio 2013-07-23 1:05 [Qemu-devel] trim in windows guest witch virtio Libaiqing @ 2013-07-23 6:34 ` Paolo Bonzini 2013-07-24 0:53 ` Libaiqing 0 siblings, 1 reply; 6+ messages in thread From: Paolo Bonzini @ 2013-07-23 6:34 UTC (permalink / raw) To: Libaiqing; +Cc: qemu-devel@nongnu.org Il 23/07/2013 03:05, Libaiqing ha scritto: > Hi paolo, > Recently I test trim function,and it works well in linux guest with ext4 fs. > > How to test it in windows guest? I got some info like this: > 1 windows7 can send discard command when the storage device is ssd; > 2 find a tool like 'fstrim', 'TRIM' the volume manually. I think it only works with IDE and AHCI on Windows. You need a filter driver to send it on SCSI disks. Paolo ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] trim in windows guest witch virtio 2013-07-23 6:34 ` Paolo Bonzini @ 2013-07-24 0:53 ` Libaiqing 2013-07-24 6:45 ` Paolo Bonzini 0 siblings, 1 reply; 6+ messages in thread From: Libaiqing @ 2013-07-24 0:53 UTC (permalink / raw) To: Paolo Bonzini; +Cc: qemu-devel@nongnu.org Hi paolo, I test window guest with ide device with the following config,trim with ide drive failed. 1 The host fs is ext4 with discard option: /dev/sdb1 on /home/sdb type ext4 (rw,relatime,discard,data=ordered) 2 qemu config : ide drive with discard open x86_64-softmmu/qemu-system-x86_64 -enable-kvm -name win7 -M pc-0.15 -m 1024 -smp 2 -boot c -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/home/win7_base.qcow2,if=ide,index=0,format=qcow2,id=ad -drive file=/home/sdb/raw.img,if=ide,index=1,format=raw,id=hd,discard=on -monitor stdio -vga qxl -vnc :1 -device usb-tablet,id=input0 3 In win7 guest,init drive d,fill it with files,then shift+del files 4 The file /home/sdb/raw.img does not become small,when listing with -s option. It seems that the windows ntfs does not send trim to ide controller. No IDE_DMA_TRIM request received. Is there any config wrong? Btw,I found the info from the URL: http://msdn.microsoft.com/en-us/library/windows/desktop/hh848053(v=vs.85).aspx Qemu can do the same thing like hyper-v with windows guest? Thanks baiqing > -----Original Message----- > From: Paolo Bonzini [mailto:pbonzini@redhat.com] > Sent: Tuesday, July 23, 2013 2:35 PM > To: Libaiqing > Cc: qemu-devel@nongnu.org > Subject: Re: trim in windows guest witch virtio > > Il 23/07/2013 03:05, Libaiqing ha scritto: > > Hi paolo, > > Recently I test trim function,and it works well in linux guest with ext4 > fs. > > > > How to test it in windows guest? I got some info like this: > > 1 windows7 can send discard command when the storage device is > ssd; > > 2 find a tool like 'fstrim', 'TRIM' the volume manually. > > I think it only works with IDE and AHCI on Windows. You need a filter > driver to send it on SCSI disks. > > Paolo ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] trim in windows guest witch virtio 2013-07-24 0:53 ` Libaiqing @ 2013-07-24 6:45 ` Paolo Bonzini 2013-07-24 7:52 ` Libaiqing 0 siblings, 1 reply; 6+ messages in thread From: Paolo Bonzini @ 2013-07-24 6:45 UTC (permalink / raw) To: Libaiqing; +Cc: qemu-devel@nongnu.org Il 24/07/2013 02:53, Libaiqing ha scritto: > Hi paolo, > > I test window guest with ide device with the following config,trim with ide drive failed. > > 1 The host fs is ext4 with discard option: > /dev/sdb1 on /home/sdb type ext4 (rw,relatime,discard,data=ordered) > > 2 qemu config : ide drive with discard open > x86_64-softmmu/qemu-system-x86_64 -enable-kvm -name win7 -M pc-0.15 -m 1024 -smp 2 -boot c -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/home/win7_base.qcow2,if=ide,index=0,format=qcow2,id=ad -drive file=/home/sdb/raw.img,if=ide,index=1,format=raw,id=hd,discard=on -monitor stdio -vga qxl -vnc :1 -device usb-tablet,id=input0 TRIM is supported only on "-M pc-1.5" and "-M pc". > 3 In win7 guest,init drive d,fill it with files,then shift+del files > > 4 The file /home/sdb/raw.img does not become small,when listing with -s option. > > It seems that the windows ntfs does not send trim to ide controller. No IDE_DMA_TRIM request received. Note that this may not happen immediately. NTFS may send TRIM later. > Is there any config wrong? > > Btw,I found the info from the URL: http://msdn.microsoft.com/en-us/library/windows/desktop/hh848053(v=vs.85).aspx > Qemu can do the same thing like hyper-v with windows guest? I don't know, I never tested it with Windows guests. It looks like Windows 8 would not need a filter driver to do TRIM on SCSI disks (you could try with megasas, so that you do not need a driver for the HBA). Paolo ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] trim in windows guest witch virtio 2013-07-24 6:45 ` Paolo Bonzini @ 2013-07-24 7:52 ` Libaiqing 2013-07-24 7:57 ` Paolo Bonzini 0 siblings, 1 reply; 6+ messages in thread From: Libaiqing @ 2013-07-24 7:52 UTC (permalink / raw) To: Paolo Bonzini; +Cc: qemu-devel@nongnu.org Hi paolo, With -M pc,trim works well in windows guest with ide device and ahci bus. About the filter driver,you mean do something in windows virtio-scsi driver,let it send unmap command to qemu? Thanks baiqing. > -----Original Message----- > From: Paolo Bonzini [mailto:pbonzini@redhat.com] > Sent: Wednesday, July 24, 2013 2:46 PM > To: Libaiqing > Cc: qemu-devel@nongnu.org > Subject: Re: trim in windows guest witch virtio > > Il 24/07/2013 02:53, Libaiqing ha scritto: > > Hi paolo, > > > > I test window guest with ide device with the following config,trim > with ide drive failed. > > > > 1 The host fs is ext4 with discard option: > > /dev/sdb1 on /home/sdb type ext4 > (rw,relatime,discard,data=ordered) > > > > 2 qemu config : ide drive with discard open > > x86_64-softmmu/qemu-system-x86_64 -enable-kvm -name win7 -M > pc-0.15 -m 1024 -smp 2 -boot c -device > piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive > file=/home/win7_base.qcow2,if=ide,index=0,format=qcow2,id=ad -drive > file=/home/sdb/raw.img,if=ide,index=1,format=raw,id=hd,discard=on > -monitor stdio -vga qxl -vnc :1 -device usb-tablet,id=input0 > > TRIM is supported only on "-M pc-1.5" and "-M pc". > > > 3 In win7 guest,init drive d,fill it with files,then shift+del files > > > > 4 The file /home/sdb/raw.img does not become small,when listing > with -s option. > > > > It seems that the windows ntfs does not send trim to ide controller. > No IDE_DMA_TRIM request received. > > Note that this may not happen immediately. NTFS may send TRIM later. > > > Is there any config wrong? > > > > Btw,I found the info from the URL: > http://msdn.microsoft.com/en-us/library/windows/desktop/hh848053(v=vs. > 85).aspx > > Qemu can do the same thing like hyper-v with windows guest? > > I don't know, I never tested it with Windows guests. It looks like > Windows 8 would not need a filter driver to do TRIM on SCSI disks (you > could try with megasas, so that you do not need a driver for the HBA). > > Paolo ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] trim in windows guest witch virtio 2013-07-24 7:52 ` Libaiqing @ 2013-07-24 7:57 ` Paolo Bonzini 0 siblings, 0 replies; 6+ messages in thread From: Paolo Bonzini @ 2013-07-24 7:57 UTC (permalink / raw) To: Libaiqing; +Cc: qemu-devel@nongnu.org Il 24/07/2013 09:52, Libaiqing ha scritto: > Hi paolo, > With -M pc,trim works well in windows guest with ide device and ahci bus. > > About the filter driver,you mean do something in windows virtio-scsi driver,let it send unmap command to qemu? Yes, it must trap the IOCTL_STORAGE_MANAGE_DATA_SET_ATTRIBUTES ioctl and convert it to a SCSI UNMAP command. But your link may suggest that it's only needed on Windows < 8 (and Server < 2012). Paolo > Thanks > baiqing. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2013-07-24 7:58 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2013-07-23 1:05 [Qemu-devel] trim in windows guest witch virtio Libaiqing 2013-07-23 6:34 ` Paolo Bonzini 2013-07-24 0:53 ` Libaiqing 2013-07-24 6:45 ` Paolo Bonzini 2013-07-24 7:52 ` Libaiqing 2013-07-24 7:57 ` Paolo Bonzini
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