Slow speed on transmission

[jrosado]

I use oleg firmware. I think the problem is on the high cpu usage that big torrent files make. At the moment, I'm downloading a 40GB torrent (about 180 files of 350MB and 700MB) and the cpu usage is very high (allways above 2.0). In this torrent, all the files have not been yet created!

Before this i tryed a single 700MB torrent file, and got speeds of 450KB/s

So, i will wait to see if the asus can manage this other torrent (is almost on it 24 hours, and not all of the 180 files have been created!)

[olfa]

Oh man, this whole transmission experience is lately pure masochistic. Previous build was finally pretty good for me. I was getting whole day constant 40 KB dl speed on public torrent with only 4 seeds and on private torrents my line was maxed 60 seconds after start. As I can't resist to newest builds always hoping for better (don't we all?) I tried today's build. It took me 45 seconds to upgrade and restart transmission. Guess what, I was getting much lower speeds on the same torrent (tried several restarts). Well, one can attribute this to the torrent nature (what is confirmed because while I am writing this post speed goes steadily up).

So I vote that previous build is very good and for the latest build time will tell. I think that transmission is back on track.

[oleo]

I think that transmission is back on track.

I am also sharing your opinion. Latest build 0.96+ (4366) maxes my line as never before.

For huge torrents I cannot tell. I suggest that you install procps package or atop and use top for displaying system load. You will see that normally CPU is 30% idle at system load over 1.0. This means that CPU is not the bottleneck. It is rather i/o.

It helps somehow if you increase cache by upgrading memory. But this is hardware mod. Oleg for example increased its wl500gP to 128MB. I've upgraded two mine wl500gx to 64MB with just 20€ investment.

[jrosado]

Here is my top result:



I do think that the problem is the cpu usage on i/o on the usb hard disk.

Of course if i put transmission with simple torrents, i get great speeds, only limited by the USB speed to the external hard disk.

I don't know if upgrading the memory is worth the risk.

One thing i know is that maybe if i used a NAS disk connected to one of the ethernet ports, the system use could be lower.

I did post a question on this forum about bulding such a system (here), but no one answer

[oleo]

It is better to go for NAS that has provision for Transmission than using external NAS for IO. I could not tell you if this approach could help you. Look for router with directly attached disk. Like FSG-3 or WL700gE. Visit www.nslu2-linux.org for more details.

I see from your top that your transmission uses 44MB of memory. 20MB resident. 12MB shared. So you are swapping all the way. There is nothing you could do to increase speed. Except somehow lowering memory usage. Maybe rtorrent is better on that although transmission always claimed its lightweight. atop could tell you if memory consumption has gradient and possible leaking.

Kill rcamd, waveserver and other unused modules to squeeze more memory.

[mancub]

Yes, this latest Transmission build has far better speeds than the previous ones so I think if nothing else surfaces we should stick with it.

[oleo]

I would also like to see that Transmission has a stable development, but recent code changes were extreme, from my point of view. I've backed at 0.82 for long time, tried 0.9x for several times and did not want to upgrade until it stabilizes. But meanwhile some users wanted newer releases. I've resisted for some time. Then bzhou upgraded Transmission and broke things. I've corrected things. Optware lost its ability of older versions and so on. So the saga continues. It looks like there will be Transmission 1.0 in near future. Anyway, I will not upgrade Transmission untill 5th Jan. 2008 as my 500GB disk failed to go through fsck and the whole computer is inaccessible to me until then
HNY