DragonFly BSD
DragonFly kernel List (threaded) for 2005-09
[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]

Re: superfetch

From: David Cuthbert <dacut@xxxxxxxxx>
Date: Wed, 14 Sep 2005 18:08:41 -0700

Hiten Pandya wrote:
Windows has a technology like binary pre-fetching for quite some time; it exists in Windows XP. This just looks like marketing stunt to me, evidently because the said feature was not publicised very well.

According to the article, the XP technology (which seems to work fairly well, IMHO) just optimizes disk access patterns. This would also prefetch pieces into memory.

One concern about this SuperFetch is this piece:

"SuperFetch has another component to it, which apparently can boost overall system performance. Vista will be able to use the storage space of peripheral storage devices such as Flash memory sticks to expand its virtual memory space. Users who are connecting a 512 MByte or 1 GByte stick to their system will see an immediate bump in virtual memory space, Microsoft said."

As Jeroen mentioned, flash devices have limited erase cycles (~100k); you don't really want to use them as swap. I'm not getting the thinking behind this bit...

[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]