linux-kernel - Re: [PATCH v6 net-next 2/5] net: implement support for low latency socket polling

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]

Message-ID: <CAJZOPZLC=drE9dTpnj2hLdDmfnL+T4gOU1j1xYwbmYy-J9HaAQ@mail.gmail.com>
Date:	Wed, 29 May 2013 21:52:16 +0300
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
Cc:	Eric Dumazet <erdnetdev@...il.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	e1000-devel@...ts.sourceforge.net,
	Willem de Bruijn <willemb@...gle.com>,
	Andi Kleen <andi@...stfloor.org>, HPA <hpa@...or.com>,
	Eilon Greenstien <eilong@...adcom.com>,
	Alex Rosenbaum <alexr@...lanox.com>,
	Eliezer Tamir <eliezer@...ir.org.il>
Subject: Re: [PATCH v6 net-next 2/5] net: implement support for low latency
 socket polling

Eliezer Tamir <eliezer.tamir@...ux.intel.com> wrote:
> Or Gerlitz wrote:

>> Unlike with TCP sockets, UDP sockets may receive packets from multiple
>> sources and hence the receiving context may be steered to be executed
>> on different cores through RSS or other Flow-Steering HW mechanisms
>> which could mean different napi contexts for the same socket, is that
>> a problem here? what's the severity?

> Nothing will break if you poll on the wrong queue.
> Your data will come through normal NAPI processing of the right queue.

Can you elaborate a little further, why you call this "wrong" and "right"?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/