12MB/s Max download speed on Synology DS1813+

[goldenegg]

I have SABNZBD 0.7.20 installed on a Synology DS1813+ NAS. For some reason, I never get much more than 12MB/s for downloads. If you download from any of my computers, I can easily max out my internet connection at around 35MB/s.

Any idea what might be causing the slowdown? The NAS is more than capable of downloading at full speed. As far as I can tell, there's no enabled speed limit. Is there an option enabled by default that might be causing me issues?

[shypike]

Did you set an article cache in Config->General? Use 512M or higher if you have ample memory.
Do set too many connections per server, something between 8 and 15 is optimal,

[goldenegg]

I just set the article cache to 512M and lowered my connections from 15 to 8, then restarted SABNZBD. So far there's no difference in download performance.

I have 4GB of RAM in the unit, so I can try to assign 1024M to the cache. Looking at the resource monitor, CPU is at 35% and RAM at 22% while downloading.

EDIT:

Tried 1024M and still no difference. Also there was no difference in RAM utilization after going to 1024M, so now I'm questioning whether or not the cache is even being used.

Also, check this out:

Sysload: 2.30 | 2.57 | 2.50 | V=2485M R=247M

The memory usage numbers don't change when adding or removing article cache. Any way to force the use of more physical memory, rather than using nearly 2.5GB of virtual memory?

[safihre]

12mb/s almost sounds like it's limited by a 100MBit network connection. Are you sure everything is linked with gigabit? When transferring stuff from and to the NAS from a computer, do you get a higher speed?
Do you have other programs on there that can download directly from the Internet? Do they reach a higher speed?

[goldenegg]

NZBget downloads around 32MB/s, as do other internet applications on the NAS. I get around 100MB/s over SMB.

I prefer the look and feel of SABNZBD, but looks like I might need to move to NZBget to obtain full performance.

[shypike]

The other software has the advantage of being written in C++
A lot more effort to write code, but more efficient runtime.

[goldenegg]

Does that mean SABNZBD is pretty much running as best as it's going to on my NAS? That's a shame.

[shypike]

Probably: yes.