{"id":2219891,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2219891/?format=json","web_url":"http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/6d9d69a8e57142a53a2da2bb9ca7ee4739e99744.1775379454.git.saviram@nvidia.com/","project":{"id":15,"url":"http://patchwork.ozlabs.org/api/1.2/projects/15/?format=json","name":"Ubuntu Kernel","link_name":"ubuntu-kernel","list_id":"kernel-team.lists.ubuntu.com","list_email":"kernel-team@lists.ubuntu.com","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<6d9d69a8e57142a53a2da2bb9ca7ee4739e99744.1775379454.git.saviram@nvidia.com>","list_archive_url":null,"date":"2026-04-05T09:02:39","name":"[SRU,N:linux-bluefield,v1,1/1] net: page_pool: scale alloc cache with PAGE_SIZE","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"a6f2717f931f3d6d3fad89e757c5572400cd0802","submitter":{"id":91107,"url":"http://patchwork.ozlabs.org/api/1.2/people/91107/?format=json","name":"Stav Aviram","email":"saviram@nvidia.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/6d9d69a8e57142a53a2da2bb9ca7ee4739e99744.1775379454.git.saviram@nvidia.com/mbox/","series":[{"id":498768,"url":"http://patchwork.ozlabs.org/api/1.2/series/498768/?format=json","web_url":"http://patchwork.ozlabs.org/project/ubuntu-kernel/list/?series=498768","date":"2026-04-05T09:02:38","name":"net: page_pool: scale alloc cache with PAGE_SIZE","version":1,"mbox":"http://patchwork.ozlabs.org/series/498768/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2219891/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2219891/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=jy7o0gKO;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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Ip=[216.228.117.161];\n Helo=[mail.nvidia.com]","X-MS-Exchange-CrossTenant-AuthSource":"\n BN1PEPF00004687.namprd05.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Anonymous","X-MS-Exchange-CrossTenant-FromEntityHeader":"HybridOnPrem","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"LV8PR12MB9134","X-BeenThere":"kernel-team@lists.ubuntu.com","X-Mailman-Version":"2.1.20","Precedence":"list","List-Id":"Kernel team discussions ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "},"content":"From: Nimrod Oren \n\nBugLink: https://bugs.launchpad.net/bugs/2147290\n\nThe current page_pool alloc-cache size and refill values were chosen to\nmatch the NAPI budget and to leave headroom for XDP_DROP recycling.\nThese fixed values do not scale well with large pages,\nas they significantly increase a given page_pool's memory footprint.\n\nScale these values to better balance memory footprint across page sizes,\nwhile keeping behavior on 4KB-page systems unchanged.\n\nReviewed-by: Dragos Tatulea \nReviewed-by: Tariq Toukan \nSigned-off-by: Nimrod Oren \nLink: https://patch.msgid.link/20260309081301.103152-1-noren@nvidia.com\nSigned-off-by: Jakub Kicinski \n(cherry picked from commit 15abbe7c82661209c1dc67c21903c07e2fff5aae)\nSigned-off-by: Stav Aviram \n---\n include/net/page_pool/types.h | 11 ++++++++++-\n 1 file changed, 10 insertions(+), 1 deletion(-)","diff":"diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h\nindex 76481c465375..08d3c46a0058 100644\n--- a/include/net/page_pool/types.h\n+++ b/include/net/page_pool/types.h\n@@ -28,6 +28,8 @@\n * use-case. The NAPI budget is 64 packets. After a NAPI poll the RX\n * ring is usually refilled and the max consumed elements will be 64,\n * thus a natural max size of objects needed in the cache.\n+ * The refill watermark is set to 64 for 4KB pages,\n+ * and scales to balance its size in bytes across page sizes.\n *\n * Keeping room for more objects, is due to XDP_DROP use-case. As\n * XDP_DROP allows the opportunity to recycle objects directly into\n@@ -35,8 +37,15 @@\n * cache is already full (or partly full) then the XDP_DROP recycles\n * would have to take a slower code path.\n */\n-#define PP_ALLOC_CACHE_SIZE\t128\n+#if PAGE_SIZE >= SZ_64K\n+#define PP_ALLOC_CACHE_REFILL\t4\n+#elif PAGE_SIZE >= SZ_16K\n+#define PP_ALLOC_CACHE_REFILL\t16\n+#else\n #define PP_ALLOC_CACHE_REFILL\t64\n+#endif\n+\n+#define PP_ALLOC_CACHE_SIZE\t(PP_ALLOC_CACHE_REFILL * 2)\n struct pp_alloc_cache {\n \tu32 count;\n \tstruct page *cache[PP_ALLOC_CACHE_SIZE];\n","prefixes":["SRU","N:linux-bluefield","v1","1/1"]}