From: Rick Jones <rick.jones2@hp.com>
To: Eric Dumazet <eric.dumazet@gmail.com>,
Michal Kazior <michal.kazior@tieto.com>
Cc: Neal Cardwell <ncardwell@google.com>,
linux-wireless <linux-wireless@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>,
Eyal Perry <eyalpe@dev.mellanox.co.il>
Subject: Re: Throughput regression with `tcp: refine TSO autosizing`
Date: Fri, 06 Feb 2015 09:48:19 -0800 [thread overview]
Message-ID: <54D4FE63.9020602@hp.com> (raw)
In-Reply-To: <1423233346.31870.136.camel@edumazet-glaptop2.roam.corp.google.com>
> If you increase ability to flood on one flow, then you need to make sure
> receiver has big rcvbuf as well.
>
> echo 2000000 >/proc/sys/net/core/rmem_default
>
> Otherwise it might drop bursts.
>
> This is the kind of things that TCP does automatically, not UDP.
An alternative, if the application involved can make explicit
setsockopt() calls to set SO_SNDBUF and/or SO_RCVBUF, is to tweak
rmem_max and wmem_max and then let the application make the setsockopt()
calls.
Which path one would take would depend on circumstances I suspect.
rick jones
WARNING: multiple messages have this Message-ID (diff)
From: Rick Jones <rick.jones2@hp.com>
To: Eric Dumazet <eric.dumazet@gmail.com>,
Michal Kazior <michal.kazior@tieto.com>
Cc: Neal Cardwell <ncardwell@google.com>,
linux-wireless <linux-wireless@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>,
Eyal Perry <eyalpe@dev.mellanox.co.il>
Subject: Re: Throughput regression with `tcp: refine TSO autosizing`
Date: Fri, 06 Feb 2015 09:48:19 -0800 [thread overview]
Message-ID: <54D4FE63.9020602@hp.com> (raw)
In-Reply-To: <1423233346.31870.136.camel@edumazet-glaptop2.roam.corp.google.com>
> If you increase ability to flood on one flow, then you need to make sure
> receiver has big rcvbuf as well.
>
> echo 2000000 >/proc/sys/net/core/rmem_default
>
> Otherwise it might drop bursts.
>
> This is the kind of things that TCP does automatically, not UDP.
An alternative, if the application involved can make explicit
setsockopt() calls to set SO_SNDBUF and/or SO_RCVBUF, is to tweak
rmem_max and wmem_max and then let the application make the setsockopt()
calls.
Which path one would take would depend on circumstances I suspect.
rick jones
next prev parent reply other threads:[~2015-02-06 17:48 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-29 11:48 Throughput regression with `tcp: refine TSO autosizing` Michal Kazior
2015-01-29 13:14 ` Eric Dumazet
2015-01-30 10:29 ` Arend van Spriel
2015-01-30 13:19 ` Eric Dumazet
2015-01-30 13:19 ` Eric Dumazet
2015-01-30 13:47 ` Arend van Spriel
2015-01-30 14:37 ` Eric Dumazet
[not found] ` <CAA93jw5fqhz0Hiw74L2GXgtZ9JsMg+NtYydKxKzGDrvQcZn4hA@mail.gmail.com>
[not found] ` <CAA93jw7b0E9jjQYXrEPzjLLC9j8xNC0TFYXpWVtgFameJaNBdw@mail.gmail.com>
[not found] ` <1422741065.199624134@apps.rackspace.com>
[not found] ` <CAPp0ZBb2nkA6Y0s=W0kw=zvyn0wi0NMBRsBCw_xcD61ScOmgQg@mail.gmail.com>
[not found] ` <CAA_e5Z46Bu+zZZFzf_ejzA35Gw3g1_OG85yv6yd7MpbwZcE-nw@mail.gmail.com>
2015-02-01 8:45 ` Fwd: " Dave Taht
2015-02-01 10:47 ` Jonathan Morton
2015-02-01 14:43 ` dpreed
2015-02-01 23:34 ` Andrew McGregor
2015-02-02 4:04 ` [Cerowrt-devel] " Avery Pennarun
2015-02-02 4:04 ` Avery Pennarun
2015-02-02 15:25 ` Jim Gettys
2015-02-02 4:21 ` Avery Pennarun
2015-02-02 7:07 ` David Lang
2015-02-02 7:07 ` David Lang
2015-01-30 13:39 ` Michal Kazior
2015-01-30 13:39 ` Michal Kazior
2015-01-30 14:40 ` Eric Dumazet
2015-01-30 14:40 ` Eric Dumazet
2015-02-02 10:27 ` Michal Kazior
2015-02-02 10:27 ` Michal Kazior
2015-02-02 18:52 ` Eric Dumazet
2015-02-02 21:25 ` Ben Greear
2015-02-02 23:06 ` Eric Dumazet
2015-02-02 23:06 ` Eric Dumazet
2015-02-03 9:00 ` Michal Kazior
2015-02-03 9:00 ` Michal Kazior
2015-02-03 1:18 ` Eric Dumazet
2015-02-03 1:18 ` Eric Dumazet
2015-02-03 11:50 ` Michal Kazior
2015-02-03 14:27 ` Eric Dumazet
2015-02-03 14:27 ` Eric Dumazet
2015-02-03 15:03 ` Eric Dumazet
2015-02-03 15:03 ` Eric Dumazet
2015-02-04 11:35 ` Michal Kazior
2015-02-04 11:57 ` Eric Dumazet
2015-02-04 11:57 ` Eric Dumazet
2015-02-04 12:22 ` Michal Kazior
2015-02-04 12:38 ` Eric Dumazet
2015-02-04 12:53 ` Michal Kazior
2015-02-04 12:55 ` Johannes Berg
2015-02-04 13:16 ` Eric Dumazet
2015-02-04 13:29 ` Eric Dumazet
2015-02-04 21:11 ` Eric Dumazet
2015-02-04 21:11 ` Eric Dumazet
2015-02-05 6:46 ` Michal Kazior
2015-02-05 6:46 ` Michal Kazior
2015-02-05 13:03 ` Eric Dumazet
2015-02-05 13:03 ` Eric Dumazet
2015-02-05 8:38 ` Michal Kazior
2015-02-05 12:57 ` Eric Dumazet
2015-02-05 13:19 ` Eric Dumazet
2015-02-05 13:33 ` Eric Dumazet
2015-02-05 13:33 ` Eric Dumazet
2015-02-05 13:44 ` Michal Kazior
2015-02-05 14:41 ` Eric Dumazet
2015-02-05 14:41 ` Eric Dumazet
2015-02-05 17:10 ` Eric Dumazet
2015-02-06 9:42 ` Michal Kazior
2015-02-06 13:40 ` Eric Dumazet
2015-02-06 13:40 ` Eric Dumazet
2015-02-06 13:53 ` Eric Dumazet
2015-02-06 13:53 ` Eric Dumazet
2015-02-06 14:09 ` Michal Kazior
2015-02-09 13:47 ` Michal Kazior
2015-02-09 15:11 ` Eric Dumazet
2015-02-10 10:33 ` Michal Kazior
2015-02-10 12:54 ` Eric Dumazet
2015-02-10 13:05 ` Eric Dumazet
2015-02-10 13:14 ` Eric Dumazet
2015-02-11 8:33 ` Michal Kazior
2015-02-11 13:17 ` Eric Dumazet
2015-02-11 13:17 ` Eric Dumazet
2015-02-12 7:16 ` Michal Kazior
2015-02-12 7:16 ` Michal Kazior
2015-02-10 14:19 ` Johannes Berg
2015-02-10 15:09 ` Eric Dumazet
2015-02-11 8:57 ` Michal Kazior
2015-02-11 8:57 ` Michal Kazior
2015-02-12 7:48 ` Michal Kazior
2015-02-12 8:33 ` Dave Taht
2015-02-24 10:24 ` Johannes Berg
2015-02-24 10:24 ` Johannes Berg
2015-02-24 10:30 ` Johannes Berg
2015-02-24 10:59 ` Johannes Berg
2015-03-31 11:08 ` Johannes Berg
2015-02-06 14:10 ` Eric Dumazet
2015-02-06 14:31 ` David Laight
2015-02-06 14:31 ` David Laight
2015-02-06 15:02 ` Eric Dumazet
2015-02-06 15:02 ` Eric Dumazet
2015-02-06 14:08 ` Michal Kazior
2015-02-06 14:08 ` Michal Kazior
2015-02-06 14:35 ` Eric Dumazet
2015-02-06 14:35 ` Eric Dumazet
2015-02-06 17:48 ` Rick Jones [this message]
2015-02-06 17:48 ` Rick Jones
2015-02-05 14:48 ` Eric Dumazet
2015-02-05 14:48 ` Eric Dumazet
2015-02-06 9:39 ` Nicolas Cavallari
2015-02-06 9:39 ` Nicolas Cavallari
2015-02-05 19:50 ` Dave Taht
2015-02-06 9:57 ` Michal Kazior
2015-02-06 9:57 ` Michal Kazior
2015-02-03 8:44 ` Michal Kazior
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