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
