Hi, On Sun, Apr 26, 2009 at 10:01:56PM +0100, Da Zheng wrote:
> I logged all RPCs and tried to analyze them. (antrik, I was wrong. > There aren't 100, 000 RPCs. The number of RPCs to the Mach during the > subhurd booting is about 20,000 - 60,000). I found something > abnormal, but I am not sure if it should be considered as errors. Yeah, while rpctracing something else, I was also surprised about the high number of failing RPCs -- this seems to be quite common throughout the Hurd. Note that such errors are not necessary bugs. As long as the error return is handled appropriately, the code can be still perfectly functional. It would be an interesting task though to investigate such failing RPCs, and see where they come from. Some of these might indeed indicate non-obvious bugs, that cause various kinds of problems. Also, there might be some room for optimization: if the caller checks for certain parameters that will obviously cause an RPC to fail up front, it would avoid the unnecessary roundtrip... Anyways, while this is an interesting project (I wonder whether it could be turned into a GSoC task for next year...), it is not likely to be related to the subhurd problems... My idea about the tracing was to compare the results of successful vs. failing runs, trying to find some differences, like different order of certain RPCs etc... But that's probably not realistic to do for traces with 20000-60000 calls :-( -antrik-
