Disk cache in 3.1 working correctly?

[FredSam43]

I've reported this in passing on some of the 3.1 betas but got no responce.

I'm wondering if the disk cache is working as designed. In 3.0 (26473) it works as I would expect: the cache gathering up lots of cache writes into a few disk writes (it fills to, say, 6 Megs for each write burst):

In 3.1(26595) the disk is kept busy (the cache stays at 0 bytes most of the time):

I'm using idential settings:

It seems to me that conbining fewer cache writes into disk writes (or equivalently doing many more disk writes) is going backwards on the "Disk I/O optimization" front. Am I missing something?

If it matters I'm running Win 7 64-bit, 8 Gigs of ram, a SSD disk with 8 Gigs free.

[GTHK]

My cache overshoots by a lot, but that's desirable compared to disk overloads.

Mmmmmmmmmm couch.

[FredSam43]

My cache overshoots by a lot, but that's desirable compared to disk overloads.

...

Yeh, but in my case they threw the baby out with the bathwater: On my system there's no way for the old uTorrent to get a disk overload (the disk light would blink now and then with a saturated net) and the current code accesses my disk many time more (the disk light is continually blinking) whether or not I have the OS's cache also enabled.