From: David Ahern <dsahern@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>,
Akshat Kakkar <akshat.1984@gmail.com>
Cc: David Laight <David.Laight@aculab.com>, netdev <netdev@vger.kernel.org>
Subject: Re: Something hitting my total number of connections to the server
Date: Tue, 22 Aug 2017 09:43:45 -0700 [thread overview]
Message-ID: <bf580154-aea9-4143-5d9c-df3764b5e745@gmail.com> (raw)
In-Reply-To: <1503406926.2499.20.camel@edumazet-glaptop3.roam.corp.google.com>
On 8/22/17 6:02 AM, Eric Dumazet wrote:
>>
>> net.core.netdev_max_backlog=10000
> This is an insane backlog.
>
https://www.kernel.org/doc/Documentation/networking/scaling.txt
"== Suggested Configuration
Flow limit is useful on systems with many concurrent connections,
where a single connection taking up 50% of a CPU indicates a problem.
In such environments, enable the feature on all CPUs that handle
network rx interrupts (as set in /proc/irq/N/smp_affinity).
The feature depends on the input packet queue length to exceed
the flow limit threshold (50%) + the flow history length (256).
Setting net.core.netdev_max_backlog to either 1000 or 10000
performed well in experiments."
next prev parent reply other threads:[~2017-08-22 16:43 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-14 9:07 Something hitting my total number of connections to the server Akshat Kakkar
2017-08-16 4:48 ` Akshat Kakkar
2017-08-16 10:34 ` Eric Dumazet
2017-08-17 9:05 ` Akshat Kakkar
2017-08-17 11:36 ` Eric Dumazet
2017-08-18 9:14 ` Akshat Kakkar
2017-08-18 12:06 ` Eric Dumazet
2017-08-18 12:44 ` Akshat Kakkar
2017-08-18 12:57 ` Eric Dumazet
2017-08-21 9:43 ` David Laight
2017-08-21 9:56 ` Akshat Kakkar
2017-08-21 14:17 ` Neal Cardwell
2017-08-21 15:17 ` Eric Dumazet
2017-08-21 17:28 ` Akshat Kakkar
2017-08-21 17:44 ` Eric Dumazet
2017-08-21 17:44 ` Eric Dumazet
2017-08-22 5:42 ` Akshat Kakkar
2017-08-22 5:44 ` Akshat Kakkar
2017-08-22 12:28 ` Neal Cardwell
2017-08-23 5:08 ` Akshat Kakkar
2017-08-23 13:35 ` Neal Cardwell
2017-08-22 13:02 ` Eric Dumazet
2017-08-22 16:43 ` David Ahern [this message]
2017-08-22 17:44 ` Eric Dumazet
2017-08-22 17:46 ` David Ahern
2017-08-22 17:50 ` Eric Dumazet
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