Re: PostgreSQL
Johnny Billquist <[email protected]>
| Newsgroups | gmane.os.netbsd.current,gmane.os.netbsd.devel.performance,gmane.os.netbsd.devel.general,gmane.os.netbsd.devel.network |
|---|---|
| Organization | Update Computer Club |
| Message-ID | <[email protected]> |
Curt Sampson wrote:
> On Thu, 2 Feb 2006, Steven M. Bellovin wrote:
>
>> What if it's doing a write across a page boundary, and the second page
>> isn't there?
>
> That's been solved for a long time, since the 6502. The you just wrap;
> write the bytes for the second page to the beginning of the initial page.
>
> :-)
>
> (My understanding is that the even the 65816 still does this, unless you
> explicitly turn it off, for compatability reasons.)
Huh? Atleast the VAX don't do that, and I would say that such a design
would be so broken as to be not usefel. It's not appreciated if the CPU
decides to go and write somewhere I didn't ask for...
But for a VAX it's perfectly okay to get a pagefault in the middle of an
instruction.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: [email protected] || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol