[WinMac] Re: SFM Ring Zero
Dan Schwartz(expresso[at]snip.net)
Mon, 18 Jan 1999 09:41:23 -0500
Dear Steve (& everyone else):
Thanks for the info! BTW, only Ring 3 (user mode) and Ring 0 (kernel mode,
a/k/a supervisor mode) is implemented in NT. The reason is that although
there are Rings 3 through 0 in the x86, only Rings 3 and 0 exist on the
Alpha (Per Sean Daily).
Yours truly,
Dan Schwartz
At 09:08 AM 1/18/99 -0500, Steve Craft replied:
>
>Yep, almost all of SFM runs in Ring 0. I'm 99% sure Microsoft put it
>there because performance in Ring3(2?) was slow, and since SFM is coded
>to logically exist "beside" the NTFS driver (which is already in Ring
>0), they put it there.
>
>That's why a BSOD in NTFS.SYS used to occur when creating SFM volumes on
>large existing directory structures (thousands of files/folders). I
>used to get them a lot with NT Server 3.51 on an AlphaServer 1000A I
>used to administer; things got better with NT4/SP4.
>
>
>Steve Craft
>stephen.craft@mail.tju.edu
>ITS - Desktop Development & Integration
>Thomas Jefferson Univ. H.
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