On Mon, Dec 18, 2017 at 07:35:48PM +, Felipe Franciosi wrote:
> >> CCed Felipe (Nutanix) and Jim (SPDK) in case they have comments.
> >
> > SPDK vhost-user targets only expect max 128 segments. They also
> > pre-allocate I/O task structures when QEMU connects to the vhost-user
> > device.
>
el@nongnu.org; Max Reitz
> ; Paolo Bonzini ; Liu, Changpeng
> ; Richard Henderson
> Subject: Re: [Qemu-devel] [PATCH 2/2] virtio: fix IO request length in virtio
> SCSI/block
>
> On Mon, Dec 18, 2017 at 10:42:35PM +0300, Denis V. Lunev wrote:
> > On 12/18/2017 10:35 PM, Feli
On Mon, Dec 18, 2017 at 10:42:35PM +0300, Denis V. Lunev wrote:
> On 12/18/2017 10:35 PM, Felipe Franciosi wrote:
> >> On 18 Dec 2017, at 16:16, Harris, James R wrote:
> >>> On Dec 18, 2017, at 6:38 AM, Stefan Hajnoczi wrote:
> >>> On Fri, Dec 15, 2017 at 06:02:50PM +0300, Denis V. Lunev wrote:
>
On 12/18/2017 10:35 PM, Felipe Franciosi wrote:
>> On 18 Dec 2017, at 16:16, Harris, James R wrote:
>>
>>
>>> On Dec 18, 2017, at 6:38 AM, Stefan Hajnoczi wrote:
>>>
>>> On Fri, Dec 15, 2017 at 06:02:50PM +0300, Denis V. Lunev wrote:
Linux guests submit IO requests no longer than PAGE_SIZE *
> On 18 Dec 2017, at 16:16, Harris, James R wrote:
>
>
>> On Dec 18, 2017, at 6:38 AM, Stefan Hajnoczi wrote:
>>
>> On Fri, Dec 15, 2017 at 06:02:50PM +0300, Denis V. Lunev wrote:
>>> Linux guests submit IO requests no longer than PAGE_SIZE * max_seg
>>> field reported by SCSI controler. Thus
> On Dec 18, 2017, at 6:38 AM, Stefan Hajnoczi wrote:
>
> On Fri, Dec 15, 2017 at 06:02:50PM +0300, Denis V. Lunev wrote:
>> Linux guests submit IO requests no longer than PAGE_SIZE * max_seg
>> field reported by SCSI controler. Thus typical sequential read with
>> 1 MB size results in the follo
On Fri, Dec 15, 2017 at 06:02:50PM +0300, Denis V. Lunev wrote:
> Linux guests submit IO requests no longer than PAGE_SIZE * max_seg
> field reported by SCSI controler. Thus typical sequential read with
> 1 MB size results in the following pattern of the IO from the guest:
> 8,16 115754
Linux guests submit IO requests no longer than PAGE_SIZE * max_seg
field reported by SCSI controler. Thus typical sequential read with
1 MB size results in the following pattern of the IO from the guest:
8,16 115754 2.766095122 2071 D R 2095104 + 1008 [dd]
8,16 115755 2.
