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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: 0aChKAA/cQREOn0KKEGqsQKYX6uXXdn5P/9+pv4OkgIrP6sdrEYgA8Fqe0XrCtGpZLQdu+/WNyke7ctMHIJbi6BXGI4IETDO/ngqHX8gawc= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR10MB5822 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 suspectscore=0 malwarescore=0 spamscore=0 adultscore=0 mlxlogscore=999 mlxscore=0 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2411130153 X-Proofpoint-ORIG-GUID: JzI5gJW_-iszLVJTSXBGnf4PH60rAeyp X-Proofpoint-GUID: JzI5gJW_-iszLVJTSXBGnf4PH60rAeyp On 11/13/24 13:22, Joseph Salisbury wrote: > > > > 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 >>> >>> >>> >>> >>> >>> >>> >>> > > I just noticed this thread, which is probably related: https://lore.kernel.org/lkml/ZxuujhhrJcoYOdMJ@BLRRASHENOY1.amd.com/T/