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

[John Garry]

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