RE: Question Bob C - Tony Lauck - Computer Audio Asylum

Computer Audio Asylum

Music servers and other computer based digital audio technologies.

RE: Question Bob C

In Reply to: RE: Question Bob C posted by fmak on December 3, 2014 at 21:28:06:

"Hardware DEP should be defeated."

Are you talking about disabling PAE Mode? If so, then this is dependent on the particular processor models and operating systems. DEP itself adds no overhead unless it traps "unclean" software. However, in 32 bit systems DEP requires PAE Mode, which adds an extra translation step to the addressing. The page tables involved have to be fetched and, depending on cache misses, may impact system performance. (The page tables contain the DEP bit that protects data on each page from being executed by malware.) Whether or not there is extra overhead in normal operation will depend on how programs are laid out in memory. In other words, this is going to be very system dependent. Perhaps there is data published that shows noise (e.g. on power rails in the computer) and how this varies according to enabling and disabling various OS/HW modes.

64 bit operating systems don't use PAE mode, so I suspect that these systems incur no overhead for DEP. (It's a separate question whether or not 64 bit systems sound better or worse than 32 bit systems. If the extra addressing capability is used constructively then overhead can be reduced, but if not then the extra address size is only going to slow things down. This will be system and application dependent.)

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

http://msdn.microsoft.com/en-us/library/windows/desktop/aa36 (Open in New Window)

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Follow Ups Full Thread

Topic - Question Bob C - fmak 04:13:32 12/3/14 (14)

RE: Question Bob C - Tony Lauck 17:15:19 12/3/14 (9)

But it does. For me - that's the end of story. - carcass93 09:35:00 12/4/14 (5)

Mercman - fmak 02:00:37 12/5/14 (2)

RE: Mercman - Tony Lauck 11:09:35 12/5/14 (1)

RE: Mercman - fmak 22:02:44 12/5/14 (0)

RE: But it does. For me - that's the end of story. - Tony Lauck 10:10:00 12/4/14 (1)

RE: But it does. For me - that's the end of story. - Bob_C 14:32:21 12/4/14 (0)

RE: Question Bob C - fmak 21:28:06 12/3/14 (2)

RE: Question Bob C - Tony Lauck 12/4/1408:30:14 12/4/14 (1)

There is nothing to protect - fmak 08:44:47 12/4/14 (0)

RE: Question Bob C - Bob_C 09:21:55 12/3/14 (3)

RE: Question Bob C - fmak 11:53:34 12/3/14 (2)

RE: Question Bob C - Bob_C 22:33:49 12/3/14 (1)

RE: Question Bob C - fmak 23:55:58 12/3/14 (0)

Follow Ups

RE: Question Bob C - Tony Lauck 12/4/1408:30:14 12/4/14 (1)

There is nothing to protect - fmak 08:44:47 12/4/14 (0)

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