[Bug 23578] Team Fortress 2: Significant lag disrupts gameplay...

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=23578





--- Comment #55 from Henri Verbeet <hverbeet at gmail.com>  2010-07-16 08:08:39 ---
(In reply to comment #54)
> ReadProcessMemory() calls NtReadVirtualMemory() which sends a
> read_process_memory request to wineserver. 
> wineserver dynamically allocates a temporary buffer (of requested size), calls
> read_process_memory with that buffer and that function is the one actually
> reading from the process's virtual memory, however, it doesn't seem efficient.
> To read the memory, it seems like its pausing a thread in the running program,
> reads the memory and lets the thread continue.
> 
Yeah, but it's worse than that. Look at the while-loop inside
read_process_memory(), and the implementation of read_thread_long().

Another reasonable theory is VAC getting suspicious due to some implementation
difference in Wine, and doing more aggressive scans because of that. I.e., that
it wouldn't scan so much under normal circumstances. Considering the time it
takes to reproduce this that would require prohibitive amounts of logging to
track down / verify though.

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