Re: Please add ST3120827AS 3.42 to NCQ blacklist

[Robert Hancock <hancockrwd@gmail.com>]

Tejun Heo wrote:
> Hello,
> 
> Giulio Orsero wrote:
>> Supermicro P8SC8, CENTOS/RHEL 5.x 2.6.18-128.el5
>> HD: Seagate SATA ST3120827AS fw3.42  [2 disks in md raid1]
>>  
>> 00:1f.1 0101: 8086:266f (rev 03)
>> 00:1f.2 0101: 8086:2652 (rev 03)
>>  
>> 2652 is handled by both ata_piix and ahci.
>> Using ata_piix everything is fine, using ahci will cause periodic errors
>> like:
>>  
>> ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
>> ata1.00: cmd 61/08:00:4d:6d:c0/00:00:00:00:00/40 tag 0 ncq 4096 out
>>          res 40/00:00:b5:95:a7/00:00:00:00:00/40 Emask 0x4 (timeout)
>> ata1.00: status: { DRDY }
>> ata1: hard resetting link
>> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>> ata1.00: configured for UDMA/133
>> ata1: EH complete
>> SCSI device sda: 234441648 512-byte hdwr sectors (120034 MB)
>> sda: Write Protect is off
>> SCSI device sda: drive cache: write back
>>
>> Using
>> echo 1 > /sys/block/sda/device/queue_depth
>> echo 1 > /sys/block/sdb/device/queue_depth
>> will eliminate the issue, so please add
>>       { "ST3120827AS",        "3.42",         ATA_HORKAGE_NONCQ },
>> to the NCQ blacklist.
> 
> That's a 7200.7 which has been quite popular && happens to be used
> extensively during libata development, so I'm highly doubtful the
> problem is a wide spread one.  The problem is more likely to be
> something specific to your configuration.

Indeed, I have a ST3160827AS (the 160GB version of that drive) with 3.42 
firmware and haven't seen any problems with NCQ..