From: Dave Taht <dave.taht@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jonathan Morton <chromatix99@gmail.com>, cake@lists.bufferbloat.net
Subject: Re: [Cake] Possible BUG - parent backlog incorrectly updated in case of NET_XMIT_CN
Date: Sun, 12 Jun 2016 09:40:45 -0700 [thread overview]
Message-ID: <CAA93jw5v-RCPSngT4wmXjjS4MwT61EntcjaYiaV0hmfyDsPAFw@mail.gmail.com> (raw)
In-Reply-To: <1465749085.7945.81.camel@edumazet-glaptop3.roam.corp.google.com>
Eric:
Quick side question (from trying to understand the qdisc locking fixes
you recently landed in net-next)
In the sqm-scripts, we are usually in a position where we are doing
both inbound and outbound rate limiting (htb + fq_codel or cake). We
typically run out of cpu or have mis-behavior on the inbound side, and
the cpu bottleneck appears to be in ksoftirqd.
A) In my failing to make sense of all the dialog around these patches
( https://lwn.net/Articles/687617/ ), it sounds like this (inbound
and outbound) processing are still locked to a single thread,
essentially?
B) But you have eliminated lot of overhead in basic qdisc processing
to much cpu benefit and we should consider backporting these changes
to lede/openwrt (4.4)?
next prev parent reply other threads:[~2016-06-12 16:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 11:20 Kevin Darbyshire-Bryant
2016-06-07 14:50 ` Jonathan Morton
2016-06-07 15:05 ` Kevin Darbyshire-Bryant
2016-06-11 9:11 ` Kevin Darbyshire-Bryant
2016-06-11 16:41 ` Jonathan Morton
2016-06-12 16:31 ` Eric Dumazet
2016-06-12 16:40 ` Dave Taht [this message]
2016-06-12 17:48 ` Eric Dumazet
2016-06-12 17:51 ` Jonathan Morton
2016-06-12 18:19 ` Eric Dumazet
2016-06-12 17:59 ` Jonathan Morton
2016-06-12 19:04 ` Eric Dumazet
2016-06-12 20:40 ` Benjamin Cronce
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