netdev - Re: netif_receive_skb is taking long time

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 25 Oct 2018 10:08:23 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Keyur Amrutbhai Patel <keyurp@...inx.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: netif_receive_skb is taking long time

On 10/25/2018 08:39 AM, Keyur Amrutbhai Patel wrote:
> Hi,
> 
> In my NIC driver "netif_receive_skb" is taking too long time. Almost 3375 neno seconds. Which is more than whole packet processing from interrupt.
> 
> Could anyone please help me to understand what could be the reason behind this? How to solve it to take minimum time?
> 
> Is there any standard calls which we need to follow in order to get faster performance?
> 

First step would be to read Documentation/networking/scaling.txt and see if anything there helps.

Have you tried to profile the kernel and see if some contention or hot function appears ?

Maybe use a faster cpu, or remove not needed features like too heavy netfilter rules.

We can not really answer your question, you do not provide enough information.