On 12/08/2022 16:41, Damien Le Moal wrote:
we noticed the commit is already in mainline now, and in our tests, there is
still similar regression and also on other platforms.
could you guide us how to check "which host driver is being used for this
test"? hope to supply some useful information.
For me, a complete kernel log may help.
I had a look yesterday with my test rig. I did not see any difference in the
default max_sectors_kb values for various drives between 5.18 and 5.19 (current
linus tree). The test machine has 2 AHCI adapters: Intel and Marvell. Both use
the regular AHCI driver. I have another rig with different ATA adapters but it
is powered down and I am traveling... So cannot test that right now.
FWIW, on QEMU I get a difference for IDE disk for ata_piix host.
Interestingly ata dev max_sectors kb also gets capped from 32MB (LBA48)
-> 256KB due to swiotlb max mapping size. (It would be capped by shost
default max sectors 512KB without that swiotlb limit). I assume capping
due to swiotlb limit is not occuring on Oliver's machine.
thanks,
John
[ 1.497233] ata7: found unknown device (class 0)
[ 1.498341] ata7.00: ATA-7: QEMU HARDDISK, 2.5+, max UDMA/100
[ 1.499030] ata7.00: 209716 sectors, multi 16: LBA48
[ 1.623795] ata2: SATA link down (SStatus 0 SControl 300)
[ 1.624633] ata1: SATA link down (SStatus 0 SControl 300)
[ 1.633395] ata6: SATA link down (SStatus 0 SControl 300)
[ 1.634200] ata5: SATA link down (SStatus 0 SControl 300)
[ 1.635094] ata4: SATA link down (SStatus 0 SControl 300)
[ 1.635887] ata3: SATA link down (SStatus 0 SControl 300)
[ 1.636748] scsi 6:0:0:0: Direct-Access ATA QEMU HARDDISK
2.5+ PQ: 0 ANSI: 5
[ 1.641298] sd 6:0:0:0: [sda] 209716 512-byte logical blocks: (107
MB/102 MiB)
[ 1.642188] sd 6:0:0:0: [sda] Write Protect is off
[ 1.642770] sd 6:0:0:0: [sda] Mode Sense: 00 3a 00 00
[ 1.642783] sd 6:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 1.644149] sd 6:0:0:0: [sda] Preferred minimum I/O size 512 bytes
[ 1.645142] sd 6:0:0:0: Attached scsi generic sg0 type 0
[ 1.655145] sd 6:0:0:0: [sda] Attached SCSI disk
