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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: rPVcklv36rYzSI0S7EZ3jjQC/VTDM7xElvhQH8K0GEklivX21qPTX5dS81P+uuYE/5qYrABsv9V3HJE14MmkprG62kID/SMYq8RPB1LTdyQ= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR10MB6556 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-11-13_10,2024-11-13_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxscore=0 spamscore=0 adultscore=0 phishscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2411130151 X-Proofpoint-GUID: kJEsZoOohJiYUFFiX8sCfDPIOvzzKrCJ X-Proofpoint-ORIG-GUID: kJEsZoOohJiYUFFiX8sCfDPIOvzzKrCJ On 11/13/24 13:19, Phil Auld wrote: > Hi, > > On Wed, Nov 13, 2024 at 01:03:00PM -0500 Joseph Salisbury wrote: >> Hello, >> >> During performance testing, we found a regression of ~9% performance with >> the TPCC benchmark.   This performance regression was introduced in >> v6.6-rc1.  After a bisect, the following commit was identified as the cause >> of the regression: >> >> 86bfbb7ce4f6 ("sched/fair: Add lag based placement") >> >> I was hoping to get some feedback from the scheduler folks.  Do you think >> gathering any additional data will help diagnose this issue?  Are there any >> tunable options that can changed to see how performance is affected? >> > You can try turning off the PLACE_LAG sched feature: > > echo NO_PLACE_LAG > /sys/kernel/debug/sched/features > > It's not what I'd call a tunable but it would allow you to test w/o it and > see what it does. It should allow you to switch back and forth easily for > testing. > > > Cheers, > Phil Thanks so much for the suggestion, Phil!  I will give that a try and report the results. > >> Thanks, >> >> Joe >> >> >> >> >> >> >> >>