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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: KYRtYtbrjp3lE+xbTBODgDdCbv1m+i9K5dd00HMOGfEUsmrwTP4DqAGGVhaBra29Bh+v23B3gIe/aS5QKlWPoCKUacV3jD4CZBVK6dbzWDSkr9hYLHREcUV6H8u0dMMqGIx4c/Eqi/x9MTnGAEJiky3dGucv5S8uzQIOwOIFy5UFrZisz6bmFJLtjATYaB7sRaXcbTXkE5NyB4mGhjM6OYlx6Tk1uij3onE02vtidd9nZy+pDS7yrNfsDE3Px4h5hG2Df7xMx86G8bV29HZHaBYD/8rReel+pdi6osmRXC0wr2hc5VfD7Tt91A0dO73tkBC1fKBkrFKd6/BxZv3jSC07OByMeAFwk7ZcQJ8kHkrRV7Rndh9NoIRZYuVjykZjy809ZxNSMG2CQr9dANvtbeE4TiCP4hkFO924kDta+P1j/gcts9QXXhQZWcB3jSyh X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2026 11:55:24.7710 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b64be310-bdcb-43c9-3f3c-08de739b987c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE33.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4071 X-Rspam-User: X-Stat-Signature: 5pxgpo5kaan1swou5hpb16gc1u8mc4gg X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 00A321C000E X-HE-Tag: 1771934131-709030 X-HE-Meta: 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 4D0Tl0OV LjYDDoeVt1TK0XbfvFLUNxLniislzZrSDVACX X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 23-Feb-26 8:32 PM, Gregory Price wrote: > On Mon, Feb 23, 2026 at 07:57:39PM +0530, Bharata B Rao wrote: >> >> Time in seconds - Lower is better >> Mop/s total - Higher is better >> ===================================================================================== >> Base Base pghot-default >> pghot-precise >> NUMAB0 NUMAB2 NUMAB2 NUMAB2 >> ===================================================================================== >> Time in seconds 7349.86 4422.50 6219.71 4113.56 >> Mop/s total 53247.66 88493.630 62923.030 95139.810 >> >> pgpromote_success 0 42181834 248503390 41955718 >> pgpromote_candidate 0 0 577086192 0 >> pgpromote_candidate_nrl 0 42181834 29410329 41956171 >> pgdemote_kswapd 0 0 216489010 0 >> numa_pte_updates 0 42252749 607470975 42037882 >> numa_hint_faults 0 42183772 606540729 41968150 >> ===================================================================================== >> >> - In the base case, the benchmark numbers improve significantly due to hot page >> promotion. >> - Though the benchmark runs for hundreds of minutes, the pages get promoted >> within the first few mins. >> - pghot-precise is able to match the base case numbers. >> - The benchmark suffers in pghot-default case due to promotion being limited >> to the default NID (0) only. This leads to excessive PTE updates, hint faults, >> demotion and promotion churn. > > Wow, this really seems to justify the extra memory usage. > > Is it possible for you to change pghot-default to move the page to a > random (or round-robin) node on the top tier instead of NID(0) by default? > > At least then pghot-default would be correct 1/N % of the time (in theory). > I'd be curious to see how close it gets to NUMAB2 with that. For pghot-default, with target_nid alternating between the available toptier nodes 0 and 1, the numbers catch up with pghot-precise and base NUMAB2 case as seen below: ================================ Time in seconds 4337.98 Mop/s total 90217.86 pgpromote_success 42170085 pgpromote_candidate 0 pgpromote_candidate_nrl 42171963 pgdemote_kswapd 0 numa_pte_updates 42338538 numa_hint_faults 42185662 ================================ Regards, Bharata.