From: "Thomas Rosenstein" <thomas.rosenstein@creamfinance.com>
To: "Jesper Dangaard Brouer" <brouer@redhat.com>
Cc: "Thomas Rosenstein via Bloat" <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] Router congestion, slow ping/ack times with kernel 5.4.60
Date: Mon, 09 Nov 2020 17:39:48 +0100 [thread overview]
Message-ID: <81F2B741-3F76-4AE1-84EB-DC65AD2BB798@creamfinance.com> (raw)
In-Reply-To: <20201109124030.71216677@carbon>
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On 9 Nov 2020, at 12:40, Jesper Dangaard Brouer wrote:
> On Mon, 09 Nov 2020 11:09:33 +0100
> "Thomas Rosenstein" <thomas.rosenstein@creamfinance.com> wrote:
>
> Could you also provide ethtool_stats for the TX interface?
>
> Notice that the tool[1] ethtool_stats.pl support monitoring several
> interfaces at the same time, e.g. run:
>
> ethtool_stats.pl --sec 3 --dev eth4 --dev ethTX
>
> And provide output as pastebin.
I have now also repeated the same test with 3.10, here are the ethtool
outputs:
https://drive.google.com/file/d/1c98MVV0JYl6Su6xZTpqwS7m-6OlbmAFp/view?usp=sharing
and the ping times:
https://drive.google.com/file/d/1xhbGJHb5jUbPsee4frbx-c-uqh-7orXY/view?usp=sharing
Sadly the parameters we were looking at are not supported below 4.14.
but I immediatly saw 1 thing very different:
ethtool --statistics eth4 | grep discards
rx_discards_phy: 0
tx_discards_phy: 0
if we check the ethtool output from 5.9.4 were have:
rx_discards_phy: 151793
And also the outbound_pci_stalled_wr_events get more frequent the lower
the total bandwidth / the higher the ping is.
Logically there must be something blocking the the buffers, either they
are not getting freed, or not rotated correctly, or processing is too
slow.
I would exclude the processing, simply based on 0% CPU load, and also
that it doesn't happen in 3.10.
Suspicious is also, that the issue only appears after a certain time of
activity (maybe total traffic?!)
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next prev parent reply other threads:[~2020-11-09 16:39 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-04 15:23 Thomas Rosenstein
2020-11-04 16:10 ` Toke Høiland-Jørgensen
2020-11-04 16:24 ` Thomas Rosenstein
2020-11-05 0:10 ` Toke Høiland-Jørgensen
2020-11-05 8:48 ` Thomas Rosenstein
2020-11-05 11:21 ` Toke Høiland-Jørgensen
2020-11-05 12:22 ` Thomas Rosenstein
2020-11-05 12:38 ` Toke Høiland-Jørgensen
2020-11-05 12:41 ` Thomas Rosenstein
2020-11-05 12:47 ` Toke Høiland-Jørgensen
2020-11-05 13:33 ` Jesper Dangaard Brouer
2020-11-06 8:48 ` Thomas Rosenstein
2020-11-06 10:53 ` Jesper Dangaard Brouer
2020-11-06 9:18 ` Thomas Rosenstein
2020-11-06 11:18 ` Jesper Dangaard Brouer
2020-11-06 11:37 ` Thomas Rosenstein
2020-11-06 11:45 ` Toke Høiland-Jørgensen
2020-11-06 12:01 ` Thomas Rosenstein
2020-11-06 12:53 ` Jesper Dangaard Brouer
2020-11-06 14:13 ` Jesper Dangaard Brouer
2020-11-06 17:04 ` Thomas Rosenstein
2020-11-06 20:19 ` Jesper Dangaard Brouer
2020-11-07 12:37 ` Thomas Rosenstein
2020-11-07 12:40 ` Jan Ceuleers
2020-11-07 12:43 ` Thomas Rosenstein
2020-11-07 13:00 ` Thomas Rosenstein
2020-11-09 8:24 ` Jesper Dangaard Brouer
2020-11-09 10:09 ` Thomas Rosenstein
2020-11-09 11:40 ` Jesper Dangaard Brouer
2020-11-09 11:51 ` Toke Høiland-Jørgensen
2020-11-09 12:25 ` Thomas Rosenstein
2020-11-09 14:33 ` Thomas Rosenstein
2020-11-12 10:05 ` Jesper Dangaard Brouer
2020-11-12 11:26 ` Thomas Rosenstein
2020-11-12 13:31 ` Jesper Dangaard Brouer
2020-11-12 13:42 ` Thomas Rosenstein
2020-11-12 15:42 ` Jesper Dangaard Brouer
2020-11-13 6:31 ` Thomas Rosenstein
2020-11-16 11:56 ` Jesper Dangaard Brouer
2020-11-16 12:05 ` Thomas Rosenstein
2020-11-09 16:39 ` Thomas Rosenstein [this message]
2020-11-07 13:33 ` Thomas Rosenstein
2020-11-07 16:46 ` Jesper Dangaard Brouer
2020-11-07 17:01 ` Thomas Rosenstein
2020-11-07 17:26 ` Sebastian Moeller
2020-11-16 12:34 ` Jesper Dangaard Brouer
2020-11-16 12:49 ` Thomas Rosenstein
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