Superfetch... how exactly does it work

whs said:

Yeah, it would be nice to have more srews to turn. But then, do you want to put the extra code into the system for the 2% of users that know how to deal with that and understand the implications.

They have it in other places for less then 2% of the user base. And considering the potential benefit from such settings...

And if coded properly there would be no additional overhead when the power user settings are disabled.

Actually, it's better to leave it ON for SSDs. I mean, if you read those articles.....it says it puts stuff into the RAM. Which is hella faster than any SSD I've seen.

Windows 7 knows this. It disabled defrags on my SSD, but left Superfetch on. :)

ikjadoon said:

Actually, it's better to leave it ON for SSDs. I mean, if you read those articles.....it says it puts stuff into the RAM. Which is hella faster than any SSD I've seen.

Windows 7 knows this. It disabled defrags on my SSD, but left Superfetch on. :)

Yeah, I have tried both ways and did not see any difference. If you leave it off, you have less writes to the SSD which is positive. The OCZ people (on their forum) recommend to turn it off and I asume they know why.

Tony posted a guide about the tweaks he does to his SSD's over at OCZ, but he says MS says that Superfetch should be turned off for SSDs.

I like the fact that's on. Don't know why now, but just feel better, lol.

ikjadoon said:

Tony posted a guide about the tweaks he does to his SSD's over at OCZ, but he says MS says that Superfetch should be turned off for SSDs.

I like the fact that's on. Don't know why now, but just feel better, lol.

One more reason to ask the question why they do not turn it off at the Win7 installation. I noticed that too.

whs said:

ikjadoon said:

Tony posted a guide about the tweaks he does to his SSD's over at OCZ, but he says MS says that Superfetch should be turned off for SSDs.

I like the fact that's on. Don't know why now, but just feel better, lol.

One more reason to ask the question why they do not turn it off at the Win7 installation. I noticed that too.

This is what MS says:

MS said:

Will Superfetch be disabled on SSDs?

MS said:

Yes, for most systems with SSDs.

If the system disk is an SSD, and the SSD performs adequately on random reads and doesn’t have glaring performance issues with random writes or flushes, then Superfetch, boot prefetching, application launch prefetching, ReadyBoost and ReadDrive will all be disabled.

Initially, we had configured all of these features to be off on all SSDs, but we encountered sizable performance regressions on some systems. In root causing those regressions, we found that some first generation SSDs had severe enough random write and flush problems that ultimately lead to disk reads being blocked for long periods of time. With Superfetch and other prefetching re-enabled, performance on key scenarios was markedly improved.

?? Are ours all just too slow, then?

Are ours all just too slow, then

Thanks for sharing the passage. Are ours too slow? I don't think so. Mine are last generation OCZ (Vertex) and Intel (25M). If those don't qualify, what does.

then the Windows Internals 5th Edition is the book you want.

Logicearth, could you provide a link please.