From: Grant <emailgrant@gmail.com>
To: Gentoo mailing list <gentoo-user@lists.gentoo.org>
Subject: [gentoo-user] Re: TCP Queuing problem
Date: Mon, 19 Sep 2016 14:25:04 -0700 [thread overview]
Message-ID: <CAN0CFw1iVY=d5Yvy1PPxr+CkMBSQ0vOtR_1XgkxgEpMqm89HsA@mail.gmail.com> (raw)
In-Reply-To: <CAN0CFw1f+iybqsg=0k+somE9vANZt9byQgWmwtMZN=84DawyTA@mail.gmail.com>
>> My web server's response time for http requests skyrockets every
>> weekday between about 9am and 5pm. I've gone over my munin graphs and
>> the only one that really correlates well with the slowdown is "TCP
>> Queuing". It looks like I normally have about 400 packets per second
>> graphed as "direct copy from queue" in munin throughout the day, but 2
>> to 3.5 times that many are periodically graphed during work hours. I
>> don't see the same pattern at all from the graph of all traffic on my
>> network interface which actually peaks over the weekend. TCP Queuing
>> doesn't rise above 400 packets per second all weekend. This is
>> consistent week after week.
>>
>> My two employees come into work during the hours in question, and they
>> certainly make frequent requests of the web server while at work, but
>> if their volume of requests were the cause of the problem then that
>> would be reflected in the graph of web server requests but it is not.
>> I do run a small MTU on the systems at work due to the config of the
>> modem/router we have there.
>>
>> Is this a recognizable problem to anyone?
>
>
> I'm in the midst of this. Are there certain attacks I should check for?
It looks like the TCP Queuing spike itself was due to imapproxy which
I've now disabled. I'll post more info as I gather it.
- Grant
next prev parent reply other threads:[~2016-09-19 21:25 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-17 21:13 [gentoo-user] TCP Queuing problem Grant
2016-09-19 17:23 ` [gentoo-user] " Grant
2016-09-19 21:25 ` Grant [this message]
2016-09-20 0:38 ` Grant
2016-09-20 13:08 ` Grant
2016-09-21 4:01 ` Kai Krakow
2016-09-21 14:30 ` Grant
2016-09-21 19:29 ` Kai Krakow
2016-09-21 19:37 ` Grant
2016-09-21 20:06 ` Kai Krakow
2016-09-21 20:28 ` Kai Krakow
2016-09-21 19:41 ` Kai Krakow
2016-09-21 19:53 ` Grant
2016-09-21 20:18 ` Kai Krakow
2016-09-21 20:47 ` Grant
2016-09-21 21:44 ` Michael Mol
2016-09-22 0:30 ` Grant
2016-09-22 7:06 ` Kai Krakow
2016-09-25 0:25 ` Grant
2016-10-01 9:57 ` Grant
2016-09-20 13:50 ` J. Roeleveld
2016-09-20 14:53 ` Grant
2016-09-20 18:06 ` J. Roeleveld
2016-09-20 19:52 ` Grant
2016-09-20 20:19 ` Alarig Le Lay
2016-09-22 16:58 ` Volker Armin Hemmann
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