* rte_pktmbuf_alloc() out of rte_mbufs
[not found] <67781150.1429748.1732243135675.ref@mail.yahoo.com>
@ 2024-11-22 2:38 ` amit sehas
2024-11-22 16:45 ` Stephen Hemminger
0 siblings, 1 reply; 2+ messages in thread
From: amit sehas @ 2024-11-22 2:38 UTC (permalink / raw)
To: users
I am frequently running into out of mbufs when allocating packets. When this happens is there a way to dump counts of which buffers are where so we know what is going on?
I know that each rte_mbuf pool also has per cpu core cache to speed up alloc/free, and some of the buffers will end up there and if one were to never utilize a particular core for a particular mpool perhaps those mbufs are lost ... that is my rough guess ...
How do you debug out of mbufs issue?
regards
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: rte_pktmbuf_alloc() out of rte_mbufs
2024-11-22 2:38 ` rte_pktmbuf_alloc() out of rte_mbufs amit sehas
@ 2024-11-22 16:45 ` Stephen Hemminger
0 siblings, 0 replies; 2+ messages in thread
From: Stephen Hemminger @ 2024-11-22 16:45 UTC (permalink / raw)
To: amit sehas; +Cc: users
On Fri, 22 Nov 2024 02:38:55 +0000 (UTC)
amit sehas <cun23@yahoo.com> wrote:
> I am frequently running into out of mbufs when allocating packets. When this happens is there a way to dump counts of which buffers are where so we know what is going on?
>
> I know that each rte_mbuf pool also has per cpu core cache to speed up alloc/free, and some of the buffers will end up there and if one were to never utilize a particular core for a particular mpool perhaps those mbufs are lost ... that is my rough guess ...
>
> How do you debug out of mbufs issue?
>
> regards
The function rte_mempool_dump() will tell you some information about the status of a particular mempool.
If you enable mempool statistics you can get more info.
The best way to size a memory pool is to account for all the possible places mbuf's can be waiting.
Something like:
Num Port * Num RxQ * Num RxD + Num Port * Num TxQ * Num TxD + Num Lcores * Burst Size + Num Lcores * Cache size
Often running out of mbufs is because of failure to free an recveived mbuf, or a buggy driver.
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2024-11-22 2:38 ` rte_pktmbuf_alloc() out of rte_mbufs amit sehas
2024-11-22 16:45 ` Stephen Hemminger
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