* [Bug 1227] KNI : memory-leaks, each time kni_rx_burst it is allocates new mbufs even if no needs.
@ 2023-05-09 14:24 bugzilla
2023-05-25 7:16 ` bugzilla
0 siblings, 1 reply; 2+ messages in thread
From: bugzilla @ 2023-05-09 14:24 UTC (permalink / raw)
To: dev
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https://bugs.dpdk.org/show_bug.cgi?id=1227
Bug ID: 1227
Summary: KNI : memory-leaks, each time kni_rx_burst it is
allocates new mbufs even if no needs.
Product: DPDK
Version: 22.11
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: dev@dpdk.org
Reporter: yasinncaner@gmail.com
Target Milestone: ---
Created attachment 251
--> https://bugs.dpdk.org/attachment.cgi?id=251&action=edit
flow_kni_rx_burst
Hello
I tried to explain memory-leak via graph
https://pastebin.ubuntu.com/p/s4h5psqtgZ/
scenario :
1. kni_alloc allocates 32 units (kni->alloc_q) then completes initialization
2. rte_kni_rx_burst receive 1 packet from kernel. 1 of 31 units is filled by
message, 31 units is empty but it is allocated in kni->alloc_q.
3. rte_kni_rx_burst then allocates another 32 units i dont know why but there
is a comment like this."If buffers removed, allocate mbufs and then put them
into alloc_q" ( How to tests buffers are removed or not? there is not any query
in code)
4. 1 message mbuf is transmited via rte_eth_tx_burst .
5. 1 message mbuf never back to freed and back to original memory pool. 31+32
units memory act like in use but they are not. never back to original memory
pool
6. this cycle goes on to 2 .
? Why there is newer allocation in rte_kni_rx_burst i dont know.
? I tried to free 1 packet via rte_pktmbuf_free but sometimes corrupt to pool
like below. sometimes 1 packet/unit back to original memory pool
[UseCount_mpool:65][avail_mpool:10334]
[UseCount_mpool:4294967135][avail_mpool:10560]
? In my view, after transmiting message to mbufs should be in to kni->free_q.
? in my view, there is missing query in func kni_allocate_mbufs to test alloc_q
is empty or not.
Best regards.
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