> -----Original Message----- > From: James Bottomley [mailto:[email protected]] > Sent: Tuesday, September 15, 2015 11:24 AM > To: Vitaly Kuznetsov <[email protected]> > Cc: [email protected]; [email protected]; KY Srinivasan > <[email protected]>; Long Li <[email protected]>; Dexuan Cui > <[email protected]> > Subject: Re: [PATCH v2] scsi: introduce short_inquiry flag for broken host > adapters > > On Tue, 2015-09-15 at 16:27 +0200, Vitaly Kuznetsov wrote: > > Vitaly Kuznetsov <[email protected]> writes: > > > > > Some host adapters (e.g. Hyper-V storvsc) are known for not respecting > the > > > SPC-2/3/4 requirement for 'INQUIRY data (see table ...) shall contain at > > > least 36 bytes'. As a result we get tons on 'scsi 0:7:1:1: scsi scan: > > > INQUIRY result too short (5), using 36' messages on console. This can be > > > problematic for slow consoles. Introduce short_inquiry host template flag > > > to avoid printing error messages for such adapters. > > > > > > Signed-off-by: Vitaly Kuznetsov <[email protected]> > > > --- > > > Changes since v1: > > > - This is a successor of previously sent "scsi_scan: move 'INQUIRY result > > > too short' message to debug level" patch. Instead of moving the > message > > > to debug level for all adapters introduce a special 'short_inquiry' flag > > > for host template [inspired by James Bottomley]. > > > > James, > > > > sorry for the ping but can you please let me know your opinion? This is > > not a 'cosmetic fix', serial port on Hyper-V is extremely slow and users > > get softlockups just because we output too much. Here is a freshly > > booted guest with SCSI and FC adapters connected: > > > > # dmesg | grep -c INQUIRY > > 2076 > > It needs a review ... preferably from someone who validates that we > don't get any adverse impact from the missing inquiry data > > > (my other pernding '[PATCH] scsi_scan: don't dump trace when > > scsi_prep_async_scan() is called twice' is related to the same issue). > > So does this.
James, I will review the code and test this as well. Regards, K. Y > > James > > > > See also: > https://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2flkml.or > g%2flkml%2f2015%2f9%2f6%2f119&data=01%7c01%7ckys%40microsoft.com > %7c7a6e9ccabb2f43c0a01108d2bdfad826%7c72f988bf86f141af91ab2d7cd011 > db47%7c1&sdata=t3IGLMiG2sU4VJfmGiYKGMy22d3IxHbGQZop63nrV7Y%3d > > > > Thanks, > > > > [...] > > > > N�����r��y����b�X��ǧv�^�){.n�+����{���"�{ay� ʇڙ�,j��f���h���z� �w��� ���j:+v���w�j�m��������zZ+�����ݢj"��!�i
