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Subject: Re: [Intel-wired-lan] Increased memory usage on NUMA nodes with ICE driver after upgrade to 6.13.y (regression in commit 492a044508ad) X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" --------------fVEh9sSXlA8SzroNF1GMjCWe Content-Type: multipart/mixed; boundary="------------p99OgUGsBD6THN16hTgbyKMz"; protected-headers="v1" From: Jacob Keller To: Jaroslav Pulchart Cc: Maciej Fijalkowski , Jakub Kicinski , Przemek Kitszel , "intel-wired-lan@lists.osuosl.org" , "Damato, Joe" , "netdev@vger.kernel.org" , "Nguyen, Anthony L" , Michal Swiatkowski , "Czapnik, Lukasz" , "Dumazet, Eric" , "Zaki, Ahmed" , Martin Karsten , Igor Raits , Daniel Secik , Zdenek Pesek Message-ID: Subject: Re: [Intel-wired-lan] Increased memory usage on NUMA nodes with ICE driver after upgrade to 6.13.y (regression in commit 492a044508ad) References: <20250625132545.1772c6ab@kernel.org> <08fae312-2e3e-4622-94ab-7960accc8008@intel.com> <366dbe9f-af4d-48ec-879e-1ac54cd5f3b6@intel.com> <252667f3-47b2-4d1f-86d6-c34ba43a6d47@intel.com> In-Reply-To: <252667f3-47b2-4d1f-86d6-c34ba43a6d47@intel.com> --------------p99OgUGsBD6THN16hTgbyKMz Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 7/7/2025 11:32 AM, Jacob Keller wrote: >=20 >=20 > On 7/3/2025 9:16 AM, Jacob Keller wrote: >> On 7/2/2025 11:46 PM, Jaroslav Pulchart wrote: >>>> think iperf doesn't do that, which might be part of whats causing th= is >>>> issue. I'm going to try to see if I can generate such fragmentation = to >>>> confirm. Is your MTU kept at the default ethernet size? >>> >>> Our MTU size is set to 9000 everywhere. >>> >> >> Ok. I am re-trying with MTU 9000 and using some traffic generated by w= rk >> now. I do see much larger memory use (~2GB) when using MTU 9000, so th= at >> tracks with what your system shows. Currently its fluctuating between >> 1.9 and 2G. I'll leave this going for a couple of days while on vacati= on >> and see if anything pops up. >> >> Thanks, >> Jake >=20 > Good news! After several days of running a wrk and iperf3 workload with= > 9k MTU, I see a significant increase in the memory usage from the page > allocations: >=20 > 7.3G 953314 drivers/net/ethernet/intel/ice/ice_txrx.c:682 [ice] > func:ice_alloc_mapped_page >=20 > ~5GB extra. >=20 > At least I can reproduce this now. Its unclear how long it took since I= > was out on vacation from Wednesday through until now. >=20 > I do have a singular hypothesis regarding the way we're currently > tracking the page count, (just based on differences between ice and > i40e). I'm going to attempt to align with i40e and re-run the test. > Hopefully I'll have some more information in a day or two. Bad news: my hypothesis was incorrect. Good news: I can immediately see the problem if I set MTU to 9K and start an iperf3 session and just watch the count of allocations from ice_alloc_mapped_pages(). It goes up consistently, so I can quickly tell if a change is helping. I ported the stats from i40e for tracking the page allocations, and I can see that we're allocating new pages despite not actually performing releases. I don't yet have a good understanding of what causes this, and the logic in ice is pretty hard to track... I'm going to try the page pool patches myself to see if this test bed triggers the same problems. Unfortunately I think I need someone else with more experience with the hotpath code to help figure out whats going wrong here... --------------p99OgUGsBD6THN16hTgbyKMz-- --------------fVEh9sSXlA8SzroNF1GMjCWe Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wnsEABYIACMWIQQgQFSp1zOQVirsQx5qll0+bw8o6AUCaGxENQUDAAAAAAAKCRBqll0+bw8o6B+9 AP4kjXwSt2BBG6RHZKy67HqBuAmi4Xh+2tvO6x3Jfrwm9wD9EXUCpXdYMuOa9xhgvTMrcgmhVvKg Yg3lEA9U+eY9nw4= =vouo -----END PGP SIGNATURE----- --------------fVEh9sSXlA8SzroNF1GMjCWe--