netdev - Re: [RFC v2] fq_codel : interval servo on hosts

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: <1346503884.7996.65.camel@edumazet-glaptop>
Date:	Sat, 01 Sep 2012 05:51:24 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	codel@...ts.bufferbloat.net, Dave Taht <dave.taht@...il.com>,
	Kathleen Nichols <nichols@...lere.com>,
	netdev <netdev@...r.kernel.org>,
	Nandita Dukkipati <nanditad@...gle.com>,
	Tomas Hruby <thruby@...gle.com>
Subject: Re: [RFC v2] fq_codel : interval servo on hosts

On Fri, 2012-08-31 at 18:37 -0700, Yuchung Cheng wrote:

> Just curious: tp->srtt is a very rough estimator, e.g., Delayed-ACks
> can easily add 40 - 200ms fuzziness. Will this affect short flows?

Good point

Delayed acks shouldnt matter, because they happen when flow had been
idle for a while.

I guess we should clamp the srtt to the default interval

if (srtt)
	q->cparams.interval = min(tcp_srtt_to_codel(srtt),
				  q->default_interval);



--
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