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9SVU/JweD1uzcINl8y5hZjGyYbh5xejNKf9a9IrqWCe26MH949d1cRDfDmi6baTfK4ZS//ftJnx3FoOXyHr5pg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR10MB6673 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-25_04,2022-11-25_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 phishscore=0 suspectscore=0 bulkscore=0 mlxscore=0 spamscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211250098 X-Proofpoint-ORIG-GUID: _aY8PmhiNV1bfdMhVLsPxnhwgPJti1pz X-Proofpoint-GUID: _aY8PmhiNV1bfdMhVLsPxnhwgPJti1pz Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 24/11/2022 03:45, Yu Kuai wrote: > Hi, > > While upgrading kernel from 4.19 to 5.10, I found that fio 1 thread 4k > sequential io performance is dropped(160Mib -> 100 Mib), root cause is > that queue_depth is changed from 64 to 256. > > commit 6e73550670ed1c07779706bb6cf61b99c871fc42 > scsi: megaraid_sas: Update optimal queue depth for SAS and NVMe devices > > diff --git a/drivers/scsi/megaraid/megaraid_sas.h > b/drivers/scsi/megaraid/megaraid_sas.h > index bd8184072bed..ddfbe6f6667a 100644 > --- a/drivers/scsi/megaraid/megaraid_sas.h > +++ b/drivers/scsi/megaraid/megaraid_sas.h > @@ -2233,9 +2233,9 @@ enum MR_PD_TYPE { > >  /* JBOD Queue depth definitions */ >  #define MEGASAS_SATA_QD        32 > -#define MEGASAS_SAS_QD 64 > +#define MEGASAS_SAS_QD 256 >  #define MEGASAS_DEFAULT_PD_QD  64 > -#define MEGASAS_NVME_QD                32 > +#define MEGASAS_NVME_QD        64 > > > And with the default nr_requests 256, 256 queue_depth will make the > elevator has no effect, specifically io can't be merged in this test > case. Hence it doesn't make sense to me to set default queue_depth to > 256. > > Is there any reason why MEGASAS_SAS_QD is changed to 64? > > Thanks, > Kuai > Which type of drive do you use? JFYI, in case missed, there was this discussion on SCSI queue depth a while ago: https://lore.kernel.org/linux-scsi/4b50f067-a368-2197-c331-a8c981f5cd02@huawei.com/ Thanks, John