How to reduce read-ahead caching ?

[bugger1]

Hi. Is there a way to tell utorrent or windows(if it's windows doing it!) to only read from the disk the amount of bytes it needs to send upstream, while seeding, instead of read-ahead more than it needs ?! For example, I can have 3.7 MiB/sec constant(!) upload globally, and yet hwinfo64 shows me that the disk reading is 10 times as much to over 30 MiB/sec constantly(!), so I can only assume this is because when utorrent wants to read a piece (or less) from the disk, possibly windows is actually reading(ahead) more than that and storing it in RAM/cache.

 

I have Superfetch windows service disabled. I'm using utorrent 3.5.5 beta build 45916 32 bit.

I have enable caching of disk reads checked in utorrent (but none of the suboptions though).

I personally think that's windows doing this but have no idea how to disable it. I've tried LargeSystemCache 0 and 1* in HKLM\System\CurrentControlSet\Control\Session Manager\Memory Management and also EnablePrefetcher in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters to 3* and 0, while EnableSuperfetch is 0*

 

* values used for the above-reported 10x disk reading.

[bugger1]

A more specific example: I've only 1 torrent running and I'm uploading to only 6 peers (while also downloading from a bunch of seeders) and the total upload to those 6 is about 100 KiB/sec constant(one peer is at 86KiB/sec constant), yet hwinfo64 shows me about 21-26 MiB/sec reading from that disk where that torrent is! Windows 7's Resource Monitor also shows me about 24MiB/sec read from that volume/disk. That disk is used exclusively for that torrent, it's otherwise empty (and defrag is disabled, and there are no compression attributes on any files/dirs). EnablePrefetcher=0, EnableSuperfetch=0 and LargeSystemCache=0 were used this time. Unchecking "enable caching of disk reads" in utorrent doesn't seem to affect anything.

 

EDIT: without changing anything, now that the download finished (torrent completed downloading) the upload speed is higher to about 646KiB/sec constant and the disk read rate seems normal to 0.8MiB/sec). So, this only happens when downloading happens. How odd! The filesystem is ntfs normal quickformatted.

 

EDIT2: I guess what I failed to say with all of this is that windows(if not utorrent itself) reads more data from disk (10+ times more!) than utorrent uploads, constantly, but this is true only when downloading happens. (posted this in this Edit because I cannot make a new post today - limited by forum)

[PiusX]

Did you look at utorrent settings first? Windows has nothing to do with torrent usage bandwidth. Otherwise you will have to read up on your router settings and use the to control utorrent bandwidth usage.

[rafi]

On 3/8/2021 at 3:53 AM, bugger1 said:

EDIT: without changing anything, now that the download finished (torrent completed downloading) the upload speed is higher to about 646KiB/sec constant and the disk read rate seems normal to 0.8MiB/sec). So, this only happens when downloading happens. How odd! The filesystem is ntfs normal quickformatted.

Downloading-hashing/allocating related?  I wouldn't worry much about this ...