Re: [regression] uas no longer queues commands since v4.5.2

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi,

On 22-05-16 12:39, Tom Yan wrote:
With commit 198de51dbc3454d95b015ca0a055b673f85f01bb, uas no longer
set `queue_depth` with scsi_change_queue_depth(), so now `queue_depth`
of UAS drives are 1. Even though `can_queue` is set to
`devinfo->qdepth - 2`, but apparently that does not help, since I can
see performance impact.

Suppose limiting `can_queue` is the right way to fix this bug
(https://bugzilla.redhat.com/show_bug.cgi?id=1315013), do we really
need to eliminate scsi_change_queue_depth() at the same time though?

No, I thought it was no longer needed, assuming the slave would
inherit the host's value, but I was mistaken, the slave will default
to a queue_depth of 1 if not specified.

I'll send out a patch fixing this right away.

Regards,

Hans
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux