From: Dave Taht <dave.taht@gmail.com>
To: Jonathan Morton <chromatix99@gmail.com>
Cc: Cake List <cake@lists.bufferbloat.net>
Subject: [Cake] codel in ebpf?
Date: Wed, 1 Aug 2018 12:20:46 -0700 [thread overview]
Message-ID: <CAA93jw5RvZSj3JBE9pS=sE29vSzNP9zonQzLBrE07XA3QAq7EQ@mail.gmail.com> (raw)
In-Reply-To: <CAA93jw4_jmGGEUUKfYLbDyLf14vp5hfcotMhLtVhwTF98MnKrQ@mail.gmail.com>
On Wed, Aug 1, 2018 at 10:25 AM Dave Taht <dave.taht@gmail.com> wrote:
>
> I wonder if ebpf has opcode space for an invsqrt?
bpf_ktime_get_ns() exists...
one thing that I don't know if bpf can do is read/write the
skb->tstamp field. The plan would be to rigorously write it (if not
supplied by hw) on all ingress ports and check it on all egress ports.
That said, every time I've tried to do something in ebpf I hit a
limitation I'd not thunk of yet. For example, where can you attach the
egress filter?
My thought would be to use a bfifo > bpf -> bql, but from what little I
understand, it's bpf -> bfifo -> bql
--
Dave Täht
CEO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-669-226-2619
next prev parent reply other threads:[~2018-08-01 19:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-01 16:22 [Cake] passing args to bpf programs Dave Taht
2018-08-01 16:35 ` Stephen Hemminger
2018-08-01 16:36 ` Dave Taht
2018-08-01 16:42 ` Jonathan Morton
2018-08-01 16:54 ` Dave Taht
2018-08-01 17:25 ` Dave Taht
2018-08-01 19:20 ` Dave Taht [this message]
2018-08-02 20:04 ` [Cake] codel in ebpf? Toke Høiland-Jørgensen
2018-08-03 0:22 ` Dave Taht
2018-08-03 10:19 ` Toke Høiland-Jørgensen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://lists.bufferbloat.net/postorius/lists/cake.lists.bufferbloat.net/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAA93jw5RvZSj3JBE9pS=sE29vSzNP9zonQzLBrE07XA3QAq7EQ@mail.gmail.com' \
--to=dave.taht@gmail.com \
--cc=cake@lists.bufferbloat.net \
--cc=chromatix99@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox