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Re: [Qemu-block] virtio-scsi and request splitting
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-block] virtio-scsi and request splitting |
Date: |
Thu, 1 Jun 2017 15:32:06 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 |
On 01/06/2017 15:30, Peter Lieven wrote:
> Hi,
>
>
> i noticed a while ago that if I start a job like this in a vserver:
>
> dd if=/dev/zero of=/x bs=1M count=128 oflag=direct
>
> I see each of the 1M request splitted into 516096 + 516096 + 16384 bytes
> with virtio-scsi
>
> If I use virtio-blk the request goes through with 1M size.
>
> Any idea whats the cause of this?
It may depend on memory fragmentation.
Paolo
- [Qemu-block] virtio-scsi and request splitting, Peter Lieven, 2017/06/01
- Re: [Qemu-block] virtio-scsi and request splitting,
Paolo Bonzini <=
- Re: [Qemu-block] virtio-scsi and request splitting, Peter Lieven, 2017/06/01
- Re: [Qemu-block] virtio-scsi and request splitting, Paolo Bonzini, 2017/06/01
- Re: [Qemu-block] virtio-scsi and request splitting, Peter Lieven, 2017/06/01
- Re: [Qemu-block] virtio-scsi and request splitting, Paolo Bonzini, 2017/06/01
- Re: [Qemu-block] virtio-scsi and request splitting, Peter Lieven, 2017/06/01
- Re: [Qemu-block] virtio-scsi and request splitting, Paolo Bonzini, 2017/06/01
- Re: [Qemu-block] virtio-scsi and request splitting, Peter Lieven, 2017/06/02