Hi Martin Can you take a look at the following patch? Long > > -----Original Message----- > > From: linux-kernel-owner@xxxxxxxxxxxxxxx > > <linux-kernel-owner@xxxxxxxxxxxxxxx> On Behalf Of Long Li > > Sent: Thursday, March 22, 2018 2:47 PM > > To: KY Srinivasan <kys@xxxxxxxxxxxxx>; Haiyang Zhang > > <haiyangz@xxxxxxxxxxxxx>; Stephen Hemminger > <sthemmin@xxxxxxxxxxxxx>; > > James E . J . Bottomley <JBottomley@xxxxxxxx>; Martin K . Petersen > > <martin.petersen@xxxxxxxxxx>; devel@xxxxxxxxxxxxxxxxxxxxxx; linux- > > scsi@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > > Cc: Long Li <longli@xxxxxxxxxxxxx> > > Subject: [PATCH v2] storvsc: Set up correct queue depth values for IDE > > devices > > > > From: Long Li <longli@xxxxxxxxxxxxx> > > > > Unlike SCSI and FC, we don't use multiple channels for IDE. > > Also fix the calculation for sub-channels. > > > > Change log: > > v2: Addressed comment on incorrect number of sub-channels. > > (Michael Kelley <Michael.H.Kelley@xxxxxxxxxxxxx>) > > > > Signed-off-by: Long Li <longli@xxxxxxxxxxxxx> > > Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx> > > > --- > > drivers/scsi/storvsc_drv.c | 7 +++++-- > > 1 file changed, 5 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c > > index 8c51d628b52e..a2ec0bc9e9fa 100644 > > --- a/drivers/scsi/storvsc_drv.c > > +++ b/drivers/scsi/storvsc_drv.c > > @@ -1722,11 +1722,14 @@ static int storvsc_probe(struct hv_device > *device, > > max_targets = STORVSC_MAX_TARGETS; > > max_channels = STORVSC_MAX_CHANNELS; > > /* > > - * On Windows8 and above, we support sub-channels for > storage. > > + * On Windows8 and above, we support sub-channels for > storage > > + * on SCSI and FC controllers. > > * The number of sub-channels offerred is based on the > number of > > * VCPUs in the guest. > > */ > > - max_sub_channels = (num_cpus / > storvsc_vcpus_per_sub_channel); > > + if (!dev_is_ide) > > + max_sub_channels = > > + (num_cpus - 1) / > storvsc_vcpus_per_sub_channel; > > } > > > > scsi_driver.can_queue = (max_outstanding_req_per_channel * > > -- > > 2.14.1
