Hi, I'm doing some performance tests in our channel driver and I realized that in calls between our channel and a SIP phone, the write callback is called almost the time in 20ms intervals, which is correct. However, sometimes the callback is called with longer intervals between each call: 60ms, 80ms and reaching 140ms.
First I thought that as a SIP call, due to network conditions, the frame can be buffered somewhere and then when the write callback is called after, e.g., 60ms, I would have a frame 3 times greater then the regular one (480 samples rather than 160) but the frame size is always of 160 samples. In my test, we receive a SIP call and the dialplan starts another call to a digital channel. After the call is answered in the other side wait a while and then hangup. During this time, I saw that the interval between the last write callback call and the current one can be longer than 20ms. I'm using a powerful machine and my asterisk process during the test uses less than 15% CPU. I'm also verifying my channel driver code to check if there is something that can cause this delay but I didn't find anything so far. It doesn't happens so often but I'm concerned this is happening. Any thoughts to help me find out where to looking at? Thanks in advance! -- -------------- Paulo Garcia _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-dev mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-dev
