[volunteergrid2-l] upload speeds

[Shawn Willden]

On Thu, Apr 12, 2012 at 8:09 PM, erpo41 at gmail.com <erpo41 at gmail.com> wrote:

>
>>> *I don't think it's my upstream connection since I have about 1000Kbps
> upstream capacity and I'm not using it for anything else.
> *I don't think it's everyone else's downstream connection because those
> are typically way faster than 200Kbps.
>

Do you mean Kbps or KBps (bits or bytes)?  If your upstream is 1000 Kbps or
1 Mbps, then your max upload speed would be about 100 KBps, so I'm assuming
you must mean KBps.

Terminology quibble out of the way, the Tahoe uploader is somewhat stupid,
as I understand it, and effectively limits your upload speed to that of the
slowest node, and then limits it some more due to inter-message waiting
delays.

I'm currently sustaining about 3.3 Mbps upload rate (measured at the NIC)
which translates to net upload speeds (reported by Tahoe) of around 230
KBps.  Since I'm using N=19, K=11, my expansion factor is 1.72, which turns
230 KBps into 396 KBps, which is 3164 Kbps.  That's far below my maximum
upstream speed (~50 Mbps), but if I can sustain 200 KBps, I can upload 17
GB per day, which is perfectly adequate for my needs.

My bigger problem is that with N=19 and only 20 nodes accepting shares even
when everything is up, my uploads tend to get stopped a lot.

-- 
Shawn
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