UDP Packet Loss and SCR 487

[danielsonchris]

I'm about 95% completed on my successful integration into the AppLogic grid. The only stopping point is what I may be erroneously attributing to UDP packet loss. I found the following link discussing such an issue. http://doc.3tera.com/AppLogic2/GuideApplianceCreation.html?configtopic=WebPublish ;ping=03%20Jul%202008%20-%2013:35#Install_and_configure_the_applia I am using an INSSL and PS8 connected to an LINUX_x64 device. With this stated where I can read more informatoin on SCR487 . Anyone have a link and or information on how I can ensure that my INSSL device and PS8 are functioning properly?

Regards,
Chris

[PeterNic]

Chris,

SCR487 is a pretty old defect from the previous generation of Xen. It refers to UDP packet drop between appliances running on the same physical server. The workaround is to set the rxbuf_min to a higher value in appliances that experience this problem (note you may need this for other network interfaces beside eth0):
echo 256 >/proc/xen/net/eth0/rxbuf_min

I am not sure it is still applicable -- you can look at the above while we check. Let me know if this helps. If not, please post more info on the type of packet loss you are observing and in what conditions.

Best regards,
-- Peter

[danielsonchris]

Peter,
Thanks for the information! The good news is in my VOIP instance I discovered that my SIP provider had had a proxy issue. After changing up my proxies I discovered that UDP is working like a champ on my appliances. So clearly the issue wasn't anywhere in the AppLogic 2.4.5 Beta stack.

I will note the rxbuf_min information for future reference.
Thanks again for your efforts.

Regards,
Chris

[PeterNic]

Chris,

You are welcome.

If you are running an interesting app, please post its name/version in http://forum.3tera.com/showthread.php?t=124

Best regards,
-- Peter