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тАО02-25-2010 06:18 AM
тАО02-25-2010 06:18 AM
tcpip equiv of tcp_deferred_ack_interval
we are having a issue with socket disconnects to asia from nyc. unix admin want us to adjust their equiv of tcp_deferred_ack_interval. I'm having trouble mapping unix parameters to VMS implementation. Any of the below close??
ia64 ovms 8.31h1 follows is what I have.
Thansk
Jim
USTBT2:SYSTEM> sysconfig -q inet
inet:
icmp_redirecttimeout = 0
icmp_rejectcodemask = 0
icmp_tcpseqcheck = 1
inifaddr_hsize = 32
ip_max_frag_index = 64
ipdefttl = 64
ipdirected_broadcast = 0
ipforwarding = 0
ipfragttl = 60
ipgateway = 0
ipport_userreserved = 65535
ipport_userreserved_min = 49152
ipqmaxlen = 2048
ipqs = 1
ipsendredirects = 1
ipsrcroute = 1
pmtu_decrease_intvl = 1200
pmtu_enabled = 1
pmtu_increase_intvl = 240
pmtu_rt_check_intvl = 20
subnetsarelocal = 1
tcbhashnum = 1
tcbhashsize = 512
tcbquicklisten = 1
tcp_compat_42 = 1
tcp_cwnd_segments = 2
tcp_dont_winscale = 0
tcp_keepalive_default = 0
tcp_keepcnt = 8
tcp_keepidle = 14400
tcp_keepinit = 150
tcp_keepintvl = 150
tcp_msl = 60
tcp_mssdflt = 536
tcpnodelack = 1
tcp_recvspace = 61440
tcp_rexmit_interval_min = 2
tcp_rexmtmax = 128
tcprexmtthresh = 3
tcp_rst_win = -1
tcp_rttdflt = 3
tcp_sendspace = 61440
tcp_syn_win = -1
tcp_ttl = 128
tcptwreorder = 0
tcp_urgent_42 = 1
udpcksum = 1
udp_recvspace = 42080
udp_sendspace = 9216
udp_ttl = 128
ovms_nobroadcastcheck = 0
ovms_printf_to_opcom = 1
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тАО02-25-2010 08:07 AM
тАО02-25-2010 08:07 AM
Re: tcpip equiv of tcp_deferred_ack_interval
you may find this of interest
10.2.11 Disabling Delaying the Acknowledgment of TCP Data
The value of the inet subsystem attribute tcpnodelack determines
whether the system delays acknowledging TCP data. The default is 0,
which delays the acknowledgment of TCP data. Usually, the default is
adequate. However, for some connections (for example, loopback), the delay
can degrade performance.
You may be able to improve network performance by setting the value of
the tcpnodelack attribute to 1, which disables the acknowledgment delay.
However, this may adversely impact network bandwidth. Use the tcpdump
command to check for excessive delays.
See Section 4.4 for information about modifying kernel subsystem
attributes.
This is from the Tru64 System Configuration and tuning manual, and the VMS TCPIP implementation came from there.
Duncan
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тАО02-25-2010 08:26 AM
тАО02-25-2010 08:26 AM
Re: tcpip equiv of tcp_deferred_ack_interval
> tcp_keepalive_default = 0
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тАО02-25-2010 05:35 PM
тАО02-25-2010 05:35 PM
Re: tcpip equiv of tcp_deferred_ack_interval
Likely as not, the path from nyc to asia is beset with packet loss problems, and unless the OpenVMS TCP/IP stack has a badly broken ACK avoidance heuristic, short of additional data, I'd say someone is desparately grasping at straws.
These however,
tcp_recvspace = 61440
tcp_sendspace = 61440
look awfully low in the context of connections running between NYC and Asia - it still does not a priori have much of anything to do with actual connection robustness, but the attachment I've put here (despite having a linux focus) describes why a WAN connection may need a rather larger TCP window.
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тАО02-25-2010 05:36 PM
тАО02-25-2010 05:36 PM
Re: tcpip equiv of tcp_deferred_ack_interval
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тАО02-26-2010 05:03 PM
тАО02-26-2010 05:03 PM
Re: tcpip equiv of tcp_deferred_ack_interval
Can you explain more about the socket disconnects?
I'm assuming you have a TCP/IP link between two servers. This link should be up all the time.
1) How often do you get disconnects?
2) Is there always traffic on the link or do you have times when the link is idle?
3) Do you see packet retransmits?
4) Is the connection being closed using the TCP/IP closing handshake of FIN ACK FIN ACK?
5) Is this connection going through a firewall?
6) Are either of the servers using DHCP for IP addresses?