mutex slow performance in windows xp on the host ESX 5 prompt

I've done a few consumer casual producer marks written in C with visual studio 2005 on dual core 2 ghz cpu, with processor type and identical win xp professional o.s., it seems to me on ESX, execution mutex, events and corresponding waitforsingleobject is 1/10th to 1/2 the speed on the physical machine, Windows 7 instead the performance is about half of the corresponding physical machine I was wondering if anyone else noticed, this is perhaps due to how mutex/criticism sections/events/semaphores are emulated in the ESX binary translation, there are all the settings of windows xp 32 bits comments under ESX 5 to allow especially stimulate the sync speed of process/thread to make it similar to a physical machine may?

I am attaching a small test project for vs 2005 in case anyone could take the trouble to try and compare the pure speed of physical synchronization primitives and ESX especially if in win xp there is a penalty of macroscopic speed or maybe I did something wrong as I ran the test on an overloaded perhaps ESX.

gf111 wrote:

Is it possible to wake up another process in win xp without incurring TPR registry bashing?

I do not know.  It is not clear to me why Windows wants to change the TPR in the first place.  The TPR is to block external interruptions, and I see not why Windows would change the external interrupts are blocked, according to what level process user is active.

I noticed that windows 7 synchronization is much faster on the same ESX with FlexPriority probably not activated, likely due to 'Lazy TPR', which I believe has been implemented in o.s. later than xp, so I guess that the more realistic prospect is to go with win 7, given I don't think that in my particular environment , I'm working on they would be willing to risk life and limb with potentially unstable FlexPriority bios patcher, has taken the fact that xp is end of life taken into charge anyway, but thanks for giving me a clue what may happen anyway.

Windows XP 64-bit is another option.  He always denigrated on the TPR, but uses instead of MMIO CR8. (AMD hotfix did the same thing with an ISA AMD extension that allows the code to 32-bit access CR8.)

Note also that FlexPriority is not a panacea.  It can reduce the cost of a TPR of 2000 update ~ cycles to ~ 400 cycles, but it is still far from what it costs in native mode, which is of ~ 2 cycles.

Binary translation, TPR updates are rather cheap, but BT has its own performance issues.

Your Windows XP guest running with binary translation or hardware-assisted virtualization?  You can check the file for 'HV Settings' vmware.log know.

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