netdev - Re: questions on NAPI processing latency and dropped network packets

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:	Mon, 21 Jan 2008 17:15:15 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Ben Greear <greearb@...delatech.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: questions on NAPI processing latency and dropped network packets

Ben Greear wrote:
> Chris Friesen wrote:
> 
>> Is there anything else we can do to minimize the latency of network 
>> packet processing and avoid having to crank the rx ring size up so high?
> 
> 
> Why is it such a big deal to crank up the rx queue length?  Seems like
> a perfectly normal way to handle bursts like this...

It means that the latency for handling those packets is higher than it 
could be.  Draining 4096 packets from the queue will take a while.

Ideally we'd like to bring the latency down as much as possible, and 
then bump up the rx queue length to handle the rest.

Chris
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html