linux-kernel - Re: [ata] 0568e61225: stress-ng.copy-file.ops_per

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Date:   Fri, 19 Aug 2022 08:54:42 +0100
From:   John Garry <john.garry@...wei.com>
To:     Oliver Sang <oliver.sang@...el.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>
CC:     Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Linux Memory Management List" <linux-mm@...ck.org>,
        <linux-ide@...r.kernel.org>, <lkp@...ts.01.org>, <lkp@...el.com>,
        <ying.huang@...el.com>, <feng.tang@...el.com>,
        <zhengjun.xing@...ux.intel.com>, <fengwei.yin@...el.com>
Subject: Re: [ata] 0568e61225: stress-ng.copy-file.ops_per_sec -15.0%
 regression

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