[Sis-SCPS-INTEREST] temporary ouf of sockets

[suvashrestha at wlink.com.np]

hi,

i had already made changes to the following files (thread.h,
scps_defines.h, scsp.h) to allow 2000 connections.

and also configured with gateway_larger = yes.

i still get the following warning when i reach about 700 connections:
gateway: reseting s1 - not enough resources
gateway: failed in chain init 3
gateway: not allowing any more connections ss2

Could this be due to the lack of RAM??? and what would u suggest i use
for benchmarking?? right now i am using iperf to create the number of
simultaneous streams.

thank u




On 8/10/2006, "Feighery, Patrick D." <feighery at mitre.org> wrote:

>Well as you found, the default number of active connections the SCPS
>gateway will support is much less that 2000.
>
>There are definitely techniques to increase them, but before I go into
>much detail, you need to look at the bandwidth of the system, the
>detail through the system and the number of connections you really want
>to support.
>
>If the bandwidth of the system is let's say 5 Mbps then each connection
>(assuming all are active at the same time) would get about 2500 bps...
>
>First lets talk about memory.   As a default the SCPS allocates a pool
>of 10 Mbps for buffering the data through the system.  Since buffer is
>allocated in 32K chunks, this results is about 300 buffers for the
>system.  Each E2E connection through the system requires both a
>transport later connection on the WAN and LAN side, and each connection
>has at a minimum of a send and receive buffer so at a minimum each
>connection needs 4 buffers = 300/4 approx 75 connections support.  2000
>connections at a minimum requires 2000*4*3276 == approx 1/4 gig of
>memory dedicated to the proxy.  Best case.  see Section 9 in the users
>manual for a little more detail.
>
>
>As for the number of sockets, section ten describes the details.
>However the following is that you need to do.
>
>1)  First configure the code with the --gateway_larger=yes
>
>2)  Make the changes to the following three source code files...
>
>In ./source/thread.h change
>#define MAX_SCPS_SOCKET	512
>          to
>#define MAX_SCPS_SOCKET	4096
>
>In ./source/scps_defines.h change
>#define MAX_SCPS_SOCKET	512
>          to
>#define MAX_SCPS_SOCKET	4096
>
>In ./include.scps.h change
>typedef long scps_fd_set[16];   /* Assumes long = 4 bytes = 32 bits */
>To
>typedef long scps_fd_set[128];   /* Assumes long = 4 bytes = 32 bits */
>
>Hope this helps.  Honestly I have not pushed the SCPS RI to this level
>yet.
>
>Best Regards
>
>	Pat
>
>
>
>
>
>
>>>-----Original Message-----
>>>From: sis-scps-interest-bounces at mailman.ccsds.org 
>>>[mailto:sis-scps-interest-bounces at mailman.ccsds.org] On 
>>>Behalf Of suvashrestha at wlink.com.np
>>>Sent: Monday, August 07, 2006 6:26 AM
>>>To: sis-scps-interest at mailman.ccsds.org
>>>Subject: [Sis-SCPS-INTEREST] temporary ouf of sockets
>>>
>>>Hello,
>>>
>>>I am running SCPS TP on a network as follows on freeBSD 6.0:
>>>
>>>client 1 -- SCPSgateway -- satellite emulator -- SCPSGateway --
>client
>>>2.....
>>>
>>>I want to generate around 2000 connections simultaneously. 
>>>When i reach
>>>upto around 500 connections, i get the following messages :
>>>We are temporary out of sockets.....reseting s1- not enough 
>>>resources....
>>>Gateway not allowing any more connections ss2... on the 2 
>>>SCPS gateways.
>>>
>>>How should i go about benchmarking??
>>>What size of RAM, nmbclusters, somaxconn, sendspace, recvspace  etc
>is
>>>advisable for the 2000 connections???
>>>
>>>Thanks in advance.
>>>
>>>_______________________________________________
>>>Sis-SCPS-INTEREST mailing list
>>>Sis-SCPS-INTEREST at mailman.ccsds.org
>>>http://mailman.ccsds.org/cgi-bin/mailman/listinfo/sis-scps-interest
>>>
>
>