netdev - Re: [Intel-wired-lan] Increased memory usage on NUMA nodes with ICE driver after upgrade to 6.13.y (regression in commit 492a044508ad)

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Message-ID: <04f3dc70-fd31-4b26-9647-c2f4ed012d8e@intel.com>
Date: Wed, 9 Jul 2025 12:11:04 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Jaroslav Pulchart <jaroslav.pulchart@...ddata.com>
CC: Maciej Fijalkowski <maciej.fijalkowski@...el.com>, Jakub Kicinski
	<kuba@...nel.org>, Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"Damato, Joe" <jdamato@...tly.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>, "Czapnik, Lukasz"
	<lukasz.czapnik@...el.com>, "Dumazet, Eric" <edumazet@...gle.com>, "Zaki,
 Ahmed" <ahmed.zaki@...el.com>, Martin Karsten <mkarsten@...terloo.ca>, "Igor
 Raits" <igor@...ddata.com>, Daniel Secik <daniel.secik@...ddata.com>, "Zdenek
 Pesek" <zdenek.pesek@...ddata.com>
Subject: Re: [Intel-wired-lan] Increased memory usage on NUMA nodes with ICE
 driver after upgrade to 6.13.y (regression in commit 492a044508ad)



On 7/8/2025 5:50 PM, Jacob Keller wrote:
> 
> 
> On 7/7/2025 3:03 PM, Jacob Keller wrote:
>> 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...
> 
> I believe I have isolated this and figured out the issue: With 9K MTU,
> sometimes the hardware posts a multi-buffer frame with an extra
> descriptor that has a size of 0 bytes with no data in it. When this
> happens, our logic for tracking buffers fails to free this buffer. We
> then later overwrite the page because we failed to either free or re-use
> the page, and our overwriting logic doesn't verify this.
> 
> I will have a fix with a more detailed description posted tomorrow.

@Jaroslav, I've posted a fix which I believe should resolve your issue:

https://lore.kernel.org/intel-wired-lan/20250709-jk-ice-fix-rx-mem-leak-v1-1-cfdd7eeea905@intel.com/T/#u

I am reasonably confident it should resolve the issue you reported. If
possible, it would be appreciated if you could test it and report back
to confirm.


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