Re: [linus:master] [block] e70c301fae: stress-ng.aiol.ops_per_sec 49.6% regression

[Oliver Sang <oliver.sang@intel.com>]

hi, Christoph Hellwig,

On Tue, Dec 17, 2024 at 05:55:28AM +0100, Christoph Hellwig wrote:
> On Fri, Dec 13, 2024 at 03:32:24PM +0100, Christoph Hellwig wrote:
> > On Thu, Dec 12, 2024 at 09:51:45PM +0800, kernel test robot wrote:
> > > 
> > > 
> > > Hello,
> > > 
> > > kernel test robot noticed a 49.6% regression of stress-ng.aiol.ops_per_sec on:
> > 
> > This sounds like there is some other I/O path that still reorders,
> > which got messed up.  What storage driver is this using?  The repro
> > material talks about an ata disk, but I'm still curious if it's ahci
> > or some other driver, or a SAS HBA?
> 
> Do you have the information on what hardware is used for this test?
> 

sorry for late.

from below information, it seems an 'ahci' to me. but since I have limited
knowledge about storage driver, maybe I'm wrong. if you want more information,
please let us know. thanks a lot!

the sata hdd for this test is as below:

lrwxrwxrwx 1 root root  9 Dec 17 06:30 ata-WDC_WD20SPZX-22UA7T0_WD-WX82EA06CSLM -> ../../sdb
lrwxrwxrwx 1 root root 10 Dec 17 06:30 ata-WDC_WD20SPZX-22UA7T0_WD-WX82EA06CSLM-part1 -> ../../sdb1

# lsblk -d -o name,rota,tran
NAME    ROTA TRAN
...
sdb        1 sata


# lspci -v | grep -i ahci
00:11.5 SATA controller: Intel Corporation C620 Series Chipset Family SSATA Controller [AHCI mode] (rev 0a) (prog-if 01 [AHCI 1.0])
        Subsystem: Intel Corporation C620 Series Chipset Family SSATA Controller [AHCI mode]
        Kernel driver in use: ahci
        Kernel modules: ahci
00:17.0 SATA controller: Intel Corporation C620 Series Chipset Family SATA Controller [AHCI mode] (rev 0a) (prog-if 01 [AHCI 1.0])
        Subsystem: Intel Corporation C620 Series Chipset Family SATA Controller [AHCI mode]
        Kernel driver in use: ahci
        Kernel modules: ahci


# dmesg | grep -i ahci
[   33.238726] ahci 0000:00:11.5: version 3.0
[   33.245238] ahci 0000:00:11.5: AHCI vers 0001.0301, 32 command slots, 6 Gbps, SATA mode
[   33.262304] ahci 0000:00:11.5: 4/4 ports implemented (port mask 0x3c)
[   33.274836] ahci 0000:00:11.5: flags: 64bit ncq sntf pm led clo only pio slum part ems deso sadm sds apst
[   33.332546] scsi host1: ahci
[   33.336259] scsi host2: ahci
[   33.438264] scsi host3: ahci
[   33.447554] scsi host4: ahci
[   33.454807] scsi host5: ahci
[   33.458574] scsi host6: ahci
[   33.462425] ahci 0000:00:17.0: AHCI vers 0001.0301, 32 command slots, 6 Gbps, SATA mode
[   33.462429] ahci 0000:00:17.0: 8/8 ports implemented (port mask 0xff)
[   33.462430] ahci 0000:00:17.0: flags: 64bit ncq sntf pm led clo only pio slum part ems deso sadm sds apst
[   33.514739] scsi host7: ahci
[   33.524035] scsi host8: ahci
[   33.531515] scsi host9: ahci
[   33.542149] scsi host10: ahci
[   33.546126] scsi host11: ahci
[   33.549890] scsi host12: ahci
[   33.553719] scsi host13: ahci
[   33.557556] scsi host14: ahci