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How to increase receive buffer...

Posts: 1
Registered: ‎04-20-2013

How to increase receive buffer...

Message 1 of 3

Hi All,


I ran the Verizon network diagnostic (working to improve internet performance).  I was wireless connected and the report is below.  The tool recommends increasing the receiver buffer. 

Does anyone know if this is something I do on my side?  I checked the router and network card settings and couldnt find any options for this.  Any help appreciated...





Analysis information:

Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done
SendBufferSize set to [261360]
running 10s outbound test (client to server) . . . . . 22.36Mb/s
running 10s inbound test (server to client) . . . . . . 26.74Mb/s

------ Client System Details ------
OS data: Name = Windows 7, Architecture = x86, Version = 6.1
Java data: Vendor = Oracle Corporation, Version = 1.7.0_17

------ Web100 Detailed Analysis ------
Client Receive Window detected at 261340 bytes.
100 Mbps FastEthernet link found.
Link set to Full Duplex mode
No network congestion discovered.
Good network cable(s) found
Normal duplex operation found.

Web100 reports the Round trip time = 74.47 msec; the Packet size = 1460 Bytes; and
No packet loss - but packets arrived out-of-order 0.83% of the time
This connection is receiver limited 19.27% of the time.
Increasing the the client's receive buffer (255.0 KB) will improve performance
This connection is sender limited 79.36% of the time.
This connection is network limited 1.35% of the time.

Web100 reports TCP negotiated the optional Performance Settings to:
RFC 2018 Selective Acknowledgment: ON
RFC 896 Nagle Algorithm: ON
RFC 3168 Explicit Congestion Notification: OFF
RFC 1323 Time Stamping: OFF
RFC 1323 Window Scaling: ON
Packet size is preserved End-to-End
Server IP addresses are preserved End-to-End
Client IP address not found. For IE users, modify the Java parameters
click Tools - Internet Options - Security - Custom Level, scroll down to
Microsoft VM - Java permissions and click Custom, click Java Custom Settings
Edit Permissions - Access to all Network Addresses, click Eanble and save changes

Platinum Contributor III
Platinum Contributor III
Posts: 5,881
Registered: ‎07-22-2009

Re: How to increase receive buffer...

Message 2 of 3

try going to download section and download their optimizer. 


That program is free and will allow you to customize or increase receive buffer sizes.


FWIW's I think the numbers you have are fine for just about any fios speed.   but if you want to try it I would use the speed guide optimization tool 

Platinum Contributor III Platinum Contributor III
Platinum Contributor III
Posts: 7,603
Registered: ‎12-15-2010

Re: How to increase receive buffer...

Message 3 of 3

If you're on Windows 7 and you're using a Wireless G connection you're likely being held back by the network connection rather than the system receive window. See if that message disappears during or after two runs while on a Wired connection to the router. Windows 7 scales the receive window based on the link capacity and latency.


If you pay for 25/25 FiOS, then boosting the receive window will help with higher latency situations. Just keep in mind Windows should automatically scale the window as a download progresses.

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