From: Paolo Bonzini <pbonzini@redhat.com>
To: Libaiqing <libaiqing@huawei.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] trim in windows guest witch virtio
Date: Wed, 24 Jul 2013 08:45:40 +0200 [thread overview]
Message-ID: <51EF7814.9050304@redhat.com> (raw)
In-Reply-To: <5D9ACBBCF6B270468D615C4719A59BE363DFF990@szxeml548-mbx.china.huawei.com>
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
next prev parent reply other threads:[~2013-07-24 6:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
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 [this message]
2013-07-24 7:52 ` Libaiqing
2013-07-24 7:57 ` Paolo Bonzini
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