Re: TCP failed connection attempts

[Dan Van Der Ster <daniel.vanderster@xxxxxxx>]

Thanks, I’ll try that. (Our current settings are the exact opposite of your suggestion).

I found an old thread discussing a new option, ms tcp rcvbuf, but I found that it is still not enabled by default in dumpling:

  "ms_tcp_rcvbuf": "0",

Not sure if that’s related.

Cheers, Dan

-- Dan van der Ster || Data & Storage Services || CERN IT Department --

On 26 Mar 2014 at 15:49:42, Ирек Фасихов (malmyzh@xxxxxxxxx) wrote:

Hi, Daniel.

I use the following settings:

net.ipv4.tcp_syncookies = 0

net.ipv4.tcp_moderate_rcvbuf=0

net.ipv4.tcp_low_latency = 1

Message "failed connection attempts", can be ignored, it is not just a server error, but the client. For example: A client lost its connection to the server.

2014-03-26 18:29 GMT+04:00 Dan Van Der Ster <daniel.vanderster@xxxxxxx>:

Hi all,

I recently noticed our OSD servers have a very large number of TCP failed connection attempts. This is typical (output from netstat -s):

    50329019 active connections openings

    15218590 passive connection openings

    44167087 failed connection attempts

I’m not a TCP expert at all — but this doesn’t look good. Do others have similar numbers? Does anyone know if some ipv4 sysctl tuning can clear this up?

Cheers, Dan

-- Dan van der Ster || Data & Storage Services || CERN IT Department --

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С уважением, Фасихов Ирек Нургаязович

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