Nginx flv stream gets too slow on 2000 concurrent connections

[Geoffrey Hartz]

Just to say... You are already hitting 1Gbits with a 1Gbit port...
It's normal that is slow... no?

2013/1/23 shahzaib shahzaib <shahzaib.cb at gmail.com>:
> I am seeing the following messages on dmesg output :-
>
> TCP: Peer 79.211.64.145:54649/80 unexpectedly shrunk window
> 347253187:347272955 (repaired)
> TCP: Peer 79.211.64.145:54649/80 unexpectedly shrunk window
> 347253187:347272955 (repaired)
> TCP: Peer 79.211.64.145:54649/80 unexpectedly shrunk window
> 347253187:347272955 (repaired)
> TCP: Peer 81.155.221.33:53075/80 unexpectedly shrunk window
> 1986341072:1986342532 (repaired)
> TCP: Peer 81.155.221.33:53075/80 unexpectedly shrunk window
> 1986341072:1986342532 (repaired)
> TCP: Peer 81.155.221.33:53075/80 unexpectedly shrunk window
> 1986341072:1986342532 (repaired)
> TCP: Peer 79.211.64.145:54709/80 unexpectedly shrunk window
> 1128744179:1128773611 (repaired)
> TCP: Peer 79.211.64.145:54709/80 unexpectedly shrunk window
> 1128744179:1128773611 (repaired)
> TCP: Peer 79.211.64.145:54709/80 unexpectedly shrunk window
> 1128744179:1128773611 (repaired)
> TCP: Peer 79.211.64.145:54709/80 unexpectedly shrunk window
> 1128744179:1128773611 (repaired)
> TCP: Peer 79.211.64.145:54709/80 unexpectedly shrunk window
> 1128744179:1128773611 (repaired)
> TCP: Peer 79.211.64.145:54709/80 unexpectedly shrunk window
> 1128744179:1128773611 (repaired)
>
>
> If somebody can explain me ? what is that shrunk window thing?
>
>
> On Thu, Jan 24, 2013 at 1:27 AM, shahzaib shahzaib <shahzaib.cb at gmail.com>
> wrote:
>>
>> No i didn't concerned with network operators yet. And if someone can get
>> me that chinese blog for setting 2k concurrent connections using
>> sysctl-settings. So far i used this guide to tune kernal.
>> http://www.cyberciti.biz/faq/linux-tcp-tuning/
>>
>>
>> On Thu, Jan 24, 2013 at 1:21 AM, shahzaib shahzaib <shahzaib.cb at gmail.com>
>> wrote:
>>>
>>> The load(nload) of 1500+ concurrent connections with 1Gbps port  is :
>>> Curr: 988.95 MBit/s
>>>                                                                    ##  ##
>>> ##  ##  ##  ##  ##  ##  #  Avg: 510.84 MBit/s
>>>                                                                    ##  ##
>>> ##  ##  ##  ##  ##  ##  #  Min: 0.00 Bit/s
>>>                                                                    ##  ##
>>> ##  ##  ##  ##  ##  ##  #  Max: 1005.17 MBit/s
>>>                                                                    ##  ##
>>> ##  ##  ##  ##  ##  ##  #  Ttl: 10017.30 GByte
>>>
>>> What should i see into dmesg to analyse the problem ? I'll also send you
>>> the nload when the traffic will hit to its peak, at this time its average
>>> traffic. The following is ifconfig eth0 output :-
>>>
>>> eth0      Link encap:Ethernet  HWaddr X:X:X:X:X:X
>>>           inet addr:X.X.X.X  Bcast:X.X.X.X  Mask:255.255.255.192
>>>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>>           RX packets:3713630148 errors:0 dropped:0 overruns:0 frame:0
>>>           TX packets:7281199166 errors:0 dropped:0 overruns:0 carrier:0
>>>           collisions:0 txqueuelen:1000
>>>           RX bytes:260499010337 (242.6 GiB)  TX bytes:10767156835559 (9.7
>>> TiB)
>>>           Memory:fbe60000-fbe80000
>>>
>>>
>>>
>>> On Thu, Jan 24, 2013 at 12:29 AM, Rainer Duffner <rainer at ultra-secure.de>
>>> wrote:
>>>>
>>>>
>>>> Am 23.01.2013 um 20:03 schrieb shahzaib shahzaib
>>>> <shahzaib.cb at gmail.com>:
>>>>
>>>> > And also the 20+ lines of vmstat are given below with 2.6.32 kernal :-
>>>>
>>>>
>>>> There was a thread recently (well, last year sometimes) with a link to a
>>>> blog in Chinese with sysctl-settings etc.
>>>> It had tunings for 2k concurrent connections.
>>>>
>>>> Maybe somebody can dig it out?
>>>> _______________________________________________
>>>> nginx mailing list
>>>> nginx at nginx.org
>>>> http://mailman.nginx.org/mailman/listinfo/nginx
>>>
>>>
>>
>
>
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-- 
Geoffrey HARTZ