[Intel-wired-lan] Linux 4.12+ memory leak on router with i40e NICs
Paweł Staszewski
pstaszewski at itcare.pl
Tue Oct 17 11:52:32 UTC 2017
W dniu 2017-10-17 o 13:05, Paweł Staszewski pisze:
>
>
> W dniu 2017-10-17 o 12:59, Paweł Staszewski pisze:
>>
>>
>> W dniu 2017-10-17 o 12:51, Paweł Staszewski pisze:
>>>
>>>
>>> W dniu 2017-10-17 o 12:20, Paweł Staszewski pisze:
>>>>
>>>>
>>>> W dniu 2017-10-17 o 11:48, Paweł Staszewski pisze:
>>>>>
>>>>>
>>>>> W dniu 2017-10-17 o 02:44, Paweł Staszewski pisze:
>>>>>>
>>>>>>
>>>>>> W dniu 2017-10-17 o 01:56, Alexander Duyck pisze:
>>>>>>> On Mon, Oct 16, 2017 at 4:34 PM, Paweł Staszewski
>>>>>>> <pstaszewski at itcare.pl> wrote:
>>>>>>>>
>>>>>>>> W dniu 2017-10-16 o 18:26, Paweł Staszewski pisze:
>>>>>>>>
>>>>>>>>>
>>>>>>>>> W dniu 2017-10-16 o 13:20, Pavlos Parissis pisze:
>>>>>>>>>> On 15/10/2017 02:58 πμ, Alexander Duyck wrote:
>>>>>>>>>>> Hi Pawel,
>>>>>>>>>>>
>>>>>>>>>>> To clarify is that Dave Miller's tree or Linus's that you
>>>>>>>>>>> are talking
>>>>>>>>>>> about? If it is Dave's tree how long ago was it you pulled
>>>>>>>>>>> it since I
>>>>>>>>>>> think the fix was just pushed by Jeff Kirsher a few days ago.
>>>>>>>>>>>
>>>>>>>>>>> The issue should be fixed in the following commit:
>>>>>>>>>>>
>>>>>>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/drivers/net/ethernet/intel/i40e/i40e_txrx.c?id=2b9478ffc550f17c6cd8c69057234e91150f5972
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>> Do you know when it is going to be available on net-next and
>>>>>>>>>> linux-stable
>>>>>>>>>> repos?
>>>>>>>>>>
>>>>>>>>>> Cheers,
>>>>>>>>>> Pavlos
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> I will make some tests today night with "net" git tree where
>>>>>>>>> this patch is
>>>>>>>>> included.
>>>>>>>>> Starting from 0:00 CET
>>>>>>>>> :)
>>>>>>>>>
>>>>>>>>>
>>>>>>>> Upgraded and looks like problem is not solved with that patch
>>>>>>>> Currently running system with
>>>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/
>>>>>>>> kernel
>>>>>>>>
>>>>>>>> Still about 0.5GB of memory is leaking somewhere
>>>>>>>>
>>>>>>>> Also can confirm that the latest kernel where memory is not
>>>>>>>> leaking (with
>>>>>>>> use i40e driver intel 710 cards) is 4.11.12
>>>>>>>> With kernel 4.11.12 - after hour no change in memory usage.
>>>>>>>>
>>>>>>>> also checked that with ixgbe instead of i40e with same net.git
>>>>>>>> kernel there
>>>>>>>> is no memleak - after hour same memory usage - so for 100% this
>>>>>>>> is i40e
>>>>>>>> driver problem.
>>>>>>> So how long was the run to get the .5GB of memory leaking?
>>>>>> 1 hour
>>>>>>
>>>>>>>
>>>>>>> Also is there any chance of you being able to bisect to determine
>>>>>>> where the memory leak was introduced since as you pointed out it
>>>>>>> didn't exist in 4.11.12 so odds are it was introduced somewhere
>>>>>>> between 4.11 and the latest kernel release.
>>>>>> Can be hard cause currently need to back to 4.11.12 - this is
>>>>>> production host/router
>>>>>> Will try to find some free/test router for tests/bicects with
>>>>>> i40e driver (intel 710 cards)
>>>>>>
>>>>>>>
>>>>>>> Thanks.
>>>>>>>
>>>>>>> - Alex
>>>>>>>
>>>>>>
>>>>>>
>>>>> Also forgoto to add errors for i40e when driver initialize:
>>>>> [ 15.760569] i40e 0000:02:00.1: Error I40E_AQ_RC_ENOSPC adding
>>>>> RX filters on PF, promiscuous mode forced on
>>>>> [ 16.365587] i40e 0000:03:00.3: Error I40E_AQ_RC_ENOSPC adding
>>>>> RX filters on PF, promiscuous mode forced on
>>>>> [ 16.367686] i40e 0000:02:00.2: Error I40E_AQ_RC_ENOSPC adding
>>>>> RX filters on PF, promiscuous mode forced on
>>>>> [ 16.368816] i40e 0000:03:00.0: Error I40E_AQ_RC_ENOSPC adding
>>>>> RX filters on PF, promiscuous mode forced on
>>>>> [ 16.369877] i40e 0000:03:00.2: Error I40E_AQ_RC_ENOSPC adding
>>>>> RX filters on PF, promiscuous mode forced on
>>>>> [ 16.370941] i40e 0000:02:00.3: Error I40E_AQ_RC_ENOSPC adding
>>>>> RX filters on PF, promiscuous mode forced on
>>>>> [ 16.372005] i40e 0000:02:00.0: Error I40E_AQ_RC_ENOSPC adding
>>>>> RX filters on PF, promiscuous mode forced on
>>>>> [ 16.373029] i40e 0000:03:00.1: Error I40E_AQ_RC_ENOSPC adding
>>>>> RX filters on PF, promiscuous mode forced on
>>>>>
>>>>> some params that are set for this nic's
>>>>> ip link set up dev $i
>>>>> ethtool -A $i autoneg off rx off tx off
>>>>> ethtool -G $i rx 1024 tx 2048
>>>>> ip link set $i txqueuelen 1000
>>>>> ethtool -C $i adaptive-rx off adaptive-tx off rx-usecs 512
>>>>> tx-usecs 128
>>>>> ethtool -L $i combined 6
>>>>> #ethtool -N $i rx-flow-hash udp4 sdfn
>>>>> ethtool -K $i ntuple on
>>>>> ethtool -K $i gro off
>>>>> ethtool -K $i tso off
>>>>>
>>>>>
>>>>>
>>>>>
>>>> Also after TSO/GRO on there is memory usage change - and leaking
>>>> faster
>>>> Below image from memory usage before change with TSO/GRO OFF and
>>>> after enabling TSO/GRO
>>>>
>>>> https://ibb.co/dTqBY6
>>>>
>>>>
>>>> Thanks
>>>> Pawel
>>>>
>>>>
>>>>
>>> With settings like this:
>>> ifc='enp2s0f0 enp2s0f1 enp2s0f2 enp2s0f3 enp3s0f0 enp3s0f1 enp3s0f2
>>> enp3s0f3'
>>> for i in $ifc
>>> do
>>> ethtool -C $i adaptive-rx off adaptive-tx off rx-usecs 512
>>> tx-usecs 128
>>> ethtool -K $i gro on
>>> ethtool -K $i tso on
>>>
>>> done
>>>
>>> Server is leaking about 4-6MB per each 10 seconds
>>> MEMLEAK:
>>> 5 MB/10sec
>>> 6 MB/10sec
>>> 4 MB/10sec
>>> 4 MB/10sec
>>>
>>>
>>> Other settings TSO/GRO off
>>> ifc='enp2s0f0 enp2s0f1 enp2s0f2 enp2s0f3 enp3s0f0 enp3s0f1 enp3s0f2
>>> enp3s0f3'
>>> for i in $ifc
>>> do
>>> ethtool -C $i adaptive-rx off adaptive-tx off rx-usecs 512
>>> tx-usecs 128
>>> ethtool -K $i gro off
>>> ethtool -K $i tso off
>>>
>>> done
>>>
>>> Same leak about 5MB per 10 seconds
>>> MEMLEAK:
>>> 5 MB/10sec
>>> 5 MB/10sec
>>> 5 MB/10sec
>>>
>>>
>>> Other settings rx-usecs change from 512 to 1024:
>>> ifc='enp2s0f0 enp2s0f1 enp2s0f2 enp2s0f3 enp3s0f0 enp3s0f1 enp3s0f2
>>> enp3s0f3'
>>> for i in $ifc
>>> do
>>> ethtool -C $i adaptive-rx off adaptive-tx off rx-usecs 1024
>>> tx-usecs 128
>>> ethtool -K $i gro off
>>> ethtool -K $i tso off
>>>
>>> done
>>>
>>> MEMLEAK:
>>> 4 MB/10sec
>>> 3 MB/10sec
>>> 4 MB/10sec
>>> 4 MB/10sec
>>>
>>>
>>> So memleak have something to do with rx-usecs (less interrupts but
>>> bigger latency for traffic)
>>>
>>>
>>> But also enabling TSO/GRO making leak about 1MB bigger for each 10
>>> seconds
>>>
>>>
>>>
>> So far best config is:
>> ifc='enp2s0f0 enp2s0f1 enp2s0f2 enp2s0f3 enp3s0f0 enp3s0f1 enp3s0f2
>> enp3s0f3'
>> for i in $ifc
>> do
>> ethtool -C $i adaptive-rx off adaptive-tx off rx-usecs 64
>> tx-usecs 512
>> ethtool -K $i gro off
>> ethtool -K $i tso on
>>
>> done
>>
>> MEMLEAK - about 2MB/10secs
>> 2 MB/10sec
>> 2 MB/10sec
>> 2 MB/10sec
>>
>>
>> With - rx-usecs set to 256 (about 7-9MB/10secs memleak)
>> ifc='enp2s0f0 enp2s0f1 enp2s0f2 enp2s0f3 enp3s0f0 enp3s0f1 enp3s0f2
>> enp3s0f3'
>> for i in $ifc
>> do
>> ethtool -C $i adaptive-rx off adaptive-tx off rx-usecs 256
>> tx-usecs 512
>> ethtool -K $i gro off
>> ethtool -K $i tso on
>>
>> done
>>
>> MEMLEAK:
>> 7 MB/10sec
>> 7 MB/10sec
>> 8 MB/10sec
>> 9 MB/10sec
>>
>>
>
> And even less memleak with rx-usecs set to 32
> ifc='enp2s0f0 enp2s0f1 enp2s0f2 enp2s0f3 enp3s0f0 enp3s0f1 enp3s0f2
> enp3s0f3'
> for i in $ifc
> do
> ethtool -C $i adaptive-rx off adaptive-tx off rx-usecs 32
> tx-usecs 512
> ethtool -K $i gro off
> ethtool -K $i tso on
>
> done
>
>
> MEMLEAK - about 0-2MB for each 10 seconds
> 0 MB/10sec
> 1 MB/10sec
> 0 MB/10sec
> 2 MB/10sec
> 1 MB/10sec
>
>
>
So best settings - to have as less leak as possible for now (rx-usecs
set to 16):
ifc='enp2s0f0 enp2s0f1 enp2s0f2 enp2s0f3 enp3s0f0 enp3s0f1 enp3s0f2
enp3s0f3'
for i in $ifc
do
ethtool -C $i adaptive-rx off adaptive-tx off rx-usecs 16
tx-usecs 768
ethtool -K $i gro on
ethtool -K $i tso on
done
MEMLEAK: (0-1MB/10seconds)
0 MB/10sec
0 MB/10sec
0 MB/10sec
1 MB/10sec
1 MB/10sec
-1 MB/10sec
1 MB/10sec
1 MB/10sec
0 MB/10sec
(there are some memory recycles - so this is good :) )
Compared to(rx-usecs 512):
ifc='enp2s0f0 enp2s0f1 enp2s0f2 enp2s0f3 enp3s0f0 enp3s0f1 enp3s0f2
enp3s0f3'
for i in $ifc
do
ethtool -C $i adaptive-rx off adaptive-tx off rx-usecs 512
tx-usecs 128
ethtool -K $i gro on
ethtool -K $i tso on
done
Server is leaking about 4-6MB per each 10 seconds
MEMLEAK:
5 MB/10sec
6 MB/10sec
4 MB/10sec
4 MB/10sec
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