Hi Rune,
Do you see any signs of general memory leak ("free") on your node?
Anyway there can be no doubt that this happens because the big buffer pool is
running empty.
We fixed that in commit 4c94cc2d3d57 ("tipc: fall back to smaller MTU if
allocation of local send skb fails") which was delivered to Linux 4.16.
Do you have any opportunity to apply that patch and try it?
BR
///jon
> -----Original Message-----
> From: Rune Torgersen <[email protected]>
> Sent: 17-Oct-19 12:38
> To: '[email protected]' <tipc-
> [email protected]>
> Subject: [tipc-discussion] Error allocating memeory error when sending RDM
> message
>
> Hi.
>
> I am running into an issue when sending SOCK_RDM or SOCK_DGRAM
> messages. On a system that has been up for a time (120+ days inthis case), I
> cannot send any RDM/DGRAM type TIPC messages that are larger than about
> 16000 bytes (16033+ fails, 15100 and smaller still works).
> Any larger messages fails with erro code 12 :"Cannot allocate memory".
>
> Really odd thing about it only happens on some connections and not others,
> on the same system (example, sending to tipc node 103:1003 gets no error,
> while sending to 103:3 get error).
> When it gets into this state, it seems to happen forever on the same
> destination address, and not on others until system is rebooted. (restarting
> the
> server side application makes no difference).
> The sends are done on the same node as the receiver is on.
>
> Kernel is Ubuntu 16.04 LTS 4.4.0-150 in this case, also seen on 161.
>
> Nametable for 103:
> 103 2 2 <1.1.1:2328193343> 2328193344
> cluster
> 103 3 3 <1.1.2:3153441800> 3153441801
> cluster
> 103 5 5 <1.1.4:269294867> 269294868
> cluster
> 103 1002 1002 <1.1.1:490133365> 490133366
> cluster
> 103 1003 1003 <1.1.2:2552019732> 2552019733
> cluster
> 103 1005 1005 <1.1.4:625110186> 625110187
> cluster
>
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