Messages in this thread | | | Date | Fri, 12 Aug 2022 18:17:39 +0100 | Subject | Re: [ata] 0568e61225: stress-ng.copy-file.ops_per_sec -15.0% regression | From | John Garry <> |
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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
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