* hard coded MAX_PHYS_SEGMENTS
@ 2015-03-24 7:00 Matthew Frederes
2015-03-24 11:07 ` Vadim Rozenfeld
0 siblings, 1 reply; 2+ messages in thread
From: Matthew Frederes @ 2015-03-24 7:00 UTC (permalink / raw)
To: kvm
Hello,
I would like to see MAX_PHYS_SEGMENTS as seen hard coded to 64 in virtio_stor.h increased, in order to get better throughput when using an LTO tape drive attached to the host SCSI adapter from within a 64-bit version of Windows Server. The tape drive supports a MaxBlock of 16,777,215.
Before I attempt to develop a patch I wanted to discuss here on this listserv...
Thank you,
Matthew D. Frederes
Business Information Technologies, Inc.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: hard coded MAX_PHYS_SEGMENTS
2015-03-24 7:00 hard coded MAX_PHYS_SEGMENTS Matthew Frederes
@ 2015-03-24 11:07 ` Vadim Rozenfeld
0 siblings, 0 replies; 2+ messages in thread
From: Vadim Rozenfeld @ 2015-03-24 11:07 UTC (permalink / raw)
To: Matthew Frederes; +Cc: kvm
On Tue, 2015-03-24 at 02:00 -0500, Matthew Frederes wrote:
> Hello,
>
> I would like to see MAX_PHYS_SEGMENTS as seen hard coded to 64 in virtio_stor.h increased, in order to get better throughput when using an LTO tape drive attached to the host SCSI adapter from within a 64-bit version of Windows Server. The tape drive supports a MaxBlock of 16,777,215.
>
> Before I attempt to develop a patch I wanted to discuss here on this listserv...
>
> Thank you,
>
> Matthew D. Frederes
> Business Information Technologies, Inc.
>
Hello Matthew,
It shouldn't be a problem to increase MAX_PHYS_SEGMENTS,
NumberOfPhysicalBreaks will be updated accordingly.
Vadim.
>
>
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