linux-kernel - Re: [PATCH RFC net-next] net: epoll support for busy poll

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:	Wed, 21 Aug 2013 06:53:08 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	Eilon Greenstein <eilong@...adcom.com>,
	Amir Vadai <amirv@...lanox.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Eliezer Tamir <eliezer@...ir.org.il>
Subject: Re: [PATCH RFC net-next] net: epoll support for busy poll

On Wed, 2013-08-21 at 13:39 +0300, Eliezer Tamir wrote:

> 
> Instead of remembering the napi_id for all the sockets in an epoll,
> we only track the first socket we see with any unique napi_id.
> The rational for this is that while there may be many thousands of
> sockets tracked by a single epoll, we expect to only see a handful
> of unique napi_ids in most cases.

This looks buggy assumption to me.

We use epoll() with in the order of millions of fds per epoller, and
typically one napi_id per cpu.

With your model, we would have to use nr_cpu epollers and make sure that
sockets are properly placed on those epollers by their napi_ids.



--
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/