Sending out bad pieces (hashfails).

[leshafunk]

Recently I have noticed I have seeding problem - often I'm constantly sending out bad pieces which fail hash check at leecher's side. A couple of kind leechers on a private tracker informed me about the problem and helped with further tests.

Of course the data is not corrupted, because after leechers reset bans they are able to complete download 100%.

After reading FAQs and forums I still have no idea where to look for the source of this problems.

My set-up:

uTorrent 2.04 (fixed custom port no.) - WinXp with correctly set-up native firewall (exclusion for uTorrent) - static local IP - wired connection to D-Link DI-824 router, port forwarding set up correctly - PPoE connection 18 Mbit/s symmetrical (100 Mbit/s for local connections, so when there is a local peer I can get 4-5 MByte/s) - static external IP.

Something ain't right there.

Steps already taken but did not help:

- uTorrent upgraded to 2.04

- outgoing Protocol Encryption - enabled

- disabled UPnP and NAT-PMP (as everything is static)

- Windows native firewall exception rule removed and created again.

Also Glasnost test didn't find any problems with ISP throttling BitTorrent traffic.

Please provide an advice what else I should check to eliminate the problem.

[DreadWingKnight]

DMZ enabled on the router (even if it's pointing at a different computer)?

[leshafunk]

DMZ enabled on the router (even if it's pointing at a different computer)?

DMZ on the router disabled (and always been disabled).

[leshafunk]

PS. All data for seeding is stored on second HDD (not the one where system is installed).

[Switeck]

Is that second HDD a NAS or USB-using drive?

[leshafunk]

Is that second HDD a NAS or USB-using drive?

No, it's just internal SATA HDD.

[Switeck]

Should be an ok drive then...it may just be overloading from non-sequential traffic.

Try increasing the uTorrent disk cache size and making sure it's ALWAYS used.

[leshafunk]

Try increasing the uTorrent disk cache size...

understood, thanks!

... and making sure it's ALWAYS used.

that's a riddle to me, sorry!

[Switeck]

Uncheck the 2nd box for one...on the disk cache page.

[leshafunk]

Uncheck the 2nd box for one...on the disk cache page.

How much could be sufficient cache size?

I can see 32 MB suggested, but that's a joke nowadays, e.g. when piece sizes are 4 MB.

[Switeck]

Maybe 100-200 MB ram ...if you try to use more windows in its infinite non-wisdom will just swap that to the hard drive swapfile.