Re: [ata] 0568e61225: stress-ng.copy-file.ops_per_sec -15.0% regression

John Garry
2022-08-19T07:54:50Z

On 19/08/2022 07:24, Oliver Sang wrote:
>> As you probably saw, I sent "[RFT PATCH] ata: libata: Set __ATA_BASE_SHT
>> max_sectors" for testing on top of v6.0-rc1, and I hope that then we can get

Based on result below, I wonder if SAS HBAs (which use libata) should
not use default SCSI max_sectors also. Any libsas HBA driver does today,
IIRC.

>> same performance as v5.19
> yeah, our test confirmed your expectation:
>
> stress-ng.copy-file.ops_per_sec
> v5.19 - 26.85
> v6.0-rc1 - 23.03
> v6.0-rc1 + your patch - 26.94
>

great, thanks

Thanks,
John