topic Re: Source Quench Received in Operating System - HP-UX

Source Quench Received

Deepak Kulkarni — Mon, 05 Nov 2007 05:17:14 GMT

When I ping to HP-UX 11.23(Intergrity) server from Windows XP client I get below message.

Reply from X.X.X.X: Source quench received.

The below message is intermittent. After some time it pings properly.

Reply from X.X.X.X: bytes=32 time<1ms TTL=255

Thanks
DK

Re: Source Quench Received

Anshumali — Mon, 05 Nov 2007 05:29:35 GMT

Search in forums, gist:

KBRC00000238

Source Quench messages are sent when the destination is unable to process traffic as fast as the source is sending it. The Source Quench ICMP tells the source to cut back
the rate at which it is sending data. The destination will continue to generate
Source Quench ICMPs until the source is sending at an acceptable speed.

To disable:
#ndd -set /dev/ip ip_send_source_quench 0
check it using
#ndd -get /dev/ip ip_send_source_quench

Anshu

Re: Source Quench Received

Deepak Kulkarni — Mon, 05 Nov 2007 06:12:31 GMT

Hi Anshumali,

Thanks for replying.
I would like to know the performance on the server, if this message displays, what is the performance problems on the server.

Thanks
DK

Re: Source Quench Received

Anshumali — Mon, 05 Nov 2007 06:23:14 GMT

these messages are telling the source to send the data at the lower speed, so you can try using packet shaper in you network team or check with the MTU size...

PHSS_17810 addresses the problem by increasing the buffer size to 128K and processing the messages every 2 minutes.

Gerhard says in another thread:

"Source Quench Messages is an IP ICMP message implying the following. The server is getting data at to high a rate and can not buffer it. This messages then means please send data in smaller bursts.

This can happen when your server forced set to a lower speed network than which the switch is force set.

Also make sure your MTU sizes between your equipment matches for ethernet generally it is set to 1500.

This can also be because of a problem on the link between to sites and the routers can not keep up with the data."

Re: Source Quench Received

Deepak Kulkarni — Mon, 05 Nov 2007 08:06:10 GMT

Thanks I found the solution.

I set ndd parameter ip_send_source_quench

ndd -set /dev/ip ip_send_source_quench 0

Rgds
DK