Hello! To debug my kernel-mode code, I use several VMs under VMware Workstation (now 6.0.4 but no difference since 5.5) - Windows 2000, XP (32 and 64-bit), 2003 (32-bit), Vista (32 and 64-bit). I noticed that 32-bit Vista guest works MUCH slower than all other OSes, regardless of their bitness. All other OSes, including 64-bit Vista, have good performance; 64-bit Vista is slower, of course, but 32-bit Vista is VERY slow. I have an old desktop (Athlon 64 X2 3800+, 2.2 GHz, Hitachi HDT722525DLA380, 7200, SATA II/NCQ, 50 MB/s avg read, 14 ms seek) and a new notebook (Acer Aspire 4920G, T8300, 2.4 GHz, WD3200BEVT, 5400, SATA II/NCQ, 55 MB/s avg read, 17 ms seek) If I run audio player (WinAMP, Foobar2000) in 64-bit Vista guest (as in Win2000/XP/2003 guests), I can use DirectSound and MME for output, and sound has no interrupts, of both computers. If I run it in 32-bit Vista guest, only Kernel Streaming in Foobar2000 allows to achieve uninterrupted sound. MME usage causes some breaks, and DirectSound usage causes many frequent breaks. My virtual device driver (Virtual Audio Cable) works fine in Win2000/XP/2003 guests, almost fine in 64-bit Vista guest, and shows many buffer underruns (no available mappings, I use WavePci) in 32-bit Vista guest. Additionally, I measured boot, logon and shutdown times for 32 and 64-bit Vista guests: Desktop (boot / logon / shutdown), sec: 32-bit Vista - 130 / 16 / 19 64-bit Vista - 104 / 6 / 9 Notebook: 32-bit Vista - 62 / 5 / 25 64-bit Vista - 38 / 3 / 10 Host systems are 32-bit XP SP2/SP3 (desktop) and 32-bit XP SP2/SP3, 64-bit XP SP1, 32-bit Vista SP1 (notebook). No difference. In 64-bit host system, all VMs perform slightly faster but 32-bit Vista performs MUCH slower than every other system. Both 32-bit and 64-bit Vista VMs have 600 MB of memory, virtual disks are resided physically near to each other, both defragmented. Tried to increase VM memory up to 2048 MB, but no effect. I tried monitor_control.vt32=true and monitor.virtual_mmu=hardware but there was no effect. Question 1: Does anybody know why 32-bit Vista performs so slow in VM, especially in audio stack activity (DirectSound/MME), in comparison to Question 2: Does anybody know what hardware (CPU/chipset/HDD) I need to get 32-bit Vista guest performance noticeably faster so it will work with audio streams without interruptions? Regards, Eugene ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/