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Wed, 20 Feb 2008

Latency problems in pohmelfs.

trying to make at least something...

As was mentioned full inode resync logic is very slow. Latency is introduced likely somewhere at protocol layer, which is used by pohmelfs. To test this scenario and find out the best possible solution I implemented trivial network module and userspace server, which talk to each other via protocol very similar to what is used in lookup/create operations in pohmelfs. Server and client also maintain trees of the objects it sent/received, so that model would be as much as possible similar to pohmelfs usage patterns.

Its time to test things and find out where the problem lies, but as usual there are problems. You are sick, everything is aching, but you want to beat the crap, to move a bit further, to make something interesting, so you start implementing the tiny bits, you start thinking, you finally make the things, so you become happy and proud, and that is just to find out, that all testing machines you had access previously are turned off, and new ones are behind a firewall and there is no access to the network from the ass of the world. This is called 'shit happens'.

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