* netdev_alloc_skb is failing for 16k length
@ 2019-05-27 6:51 Arun Kumar Neelakantam
2019-05-27 14:59 ` Stephen Hemminger
0 siblings, 1 reply; 3+ messages in thread
From: Arun Kumar Neelakantam @ 2019-05-27 6:51 UTC (permalink / raw)
To: netdev, Bjorn Andersson, Chris Lew
Hi team,
we are using "skb = netdev_alloc_skb(NULL, len);" which is getting
failed sometimes for len = 16k.
I suspect mostly system memory got fragmented and hence atomic memory
allocation for 16k is failing, can you please suggest best way to handle
this failure case.
Thanks
Arun N
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: netdev_alloc_skb is failing for 16k length
2019-05-27 6:51 netdev_alloc_skb is failing for 16k length Arun Kumar Neelakantam
@ 2019-05-27 14:59 ` Stephen Hemminger
2019-05-28 10:08 ` Arun Kumar Neelakantam
0 siblings, 1 reply; 3+ messages in thread
From: Stephen Hemminger @ 2019-05-27 14:59 UTC (permalink / raw)
To: Arun Kumar Neelakantam; +Cc: netdev, Bjorn Andersson, Chris Lew
On Mon, 27 May 2019 12:21:51 +0530
Arun Kumar Neelakantam <aneela@codeaurora•org> wrote:
> Hi team,
>
> we are using "skb = netdev_alloc_skb(NULL, len);" which is getting
> failed sometimes for len = 16k.
>
> I suspect mostly system memory got fragmented and hence atomic memory
> allocation for 16k is failing, can you please suggest best way to handle
> this failure case.
>
> Thanks
>
> Arun N
>
If you are handling big frames, then put the data in page size chunks
and use build_skb.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: netdev_alloc_skb is failing for 16k length
2019-05-27 14:59 ` Stephen Hemminger
@ 2019-05-28 10:08 ` Arun Kumar Neelakantam
0 siblings, 0 replies; 3+ messages in thread
From: Arun Kumar Neelakantam @ 2019-05-28 10:08 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: netdev, Bjorn Andersson, Chris Lew
On 5/27/2019 8:29 PM, Stephen Hemminger wrote:
> On Mon, 27 May 2019 12:21:51 +0530
> Arun Kumar Neelakantam <aneela@codeaurora•org> wrote:
>
>> Hi team,
>>
>> we are using "skb = netdev_alloc_skb(NULL, len);" which is getting
>> failed sometimes for len = 16k.
>>
>> I suspect mostly system memory got fragmented and hence atomic memory
>> allocation for 16k is failing, can you please suggest best way to handle
>> this failure case.
>>
>> Thanks
>>
>> Arun N
>>
> If you are handling big frames, then put the data in page size chunks
> and use build_skb.
Thank you. Now using alloc_skb_with_frags() with order 0 to allocate the
memory fragments
and skb_store_bits() to store the data to skb from buffer.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-05-28 10:08 UTC | newest]
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2019-05-27 6:51 netdev_alloc_skb is failing for 16k length Arun Kumar Neelakantam
2019-05-27 14:59 ` Stephen Hemminger
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