id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	launchpad_bug
1844	slow download speeds	l3iggs	davidsarah	"I have 2 storage servers and one client machine.[[BR]]
storage-serverA = 4x1.6 GHz, 3GB of ram, on home lan[[BR]]
storage-serverB = 2x2.3 Ghz, 31GB of ram, remote locaction[[BR]]
client = 4x2.4 GHz, 4 GB of ram, on home lan[[BR]]
I have[[BR]]
k=1[[BR]]
N=2[[BR]]
h=2[[BR]]
When I download a 104MB file from my cluster using[[BR]]
wget http://localhost:$PORT/uri/$CAP [[BR]]
wget reports that file transfer takes place at ~1.5M/s and completes in 67 seconds[[BR]]
In this example, storage-serverA (on my lan) transfers the entire file (see attached file dlStatus.html)[[BR]]
During the transfer tahoe consumes 76% of one core of the CPU on storage-serverA. And 16% of one core of the CPU on client.[[BR]]

The same file transferred using[[BR]]
scp user@storage-serverA:/file[[BR]]
takes place at ~12.3 MB/s and completes in 8 seconds.[[BR]]
During this transfer, sshd consumes 103% of one core of the CPU on storage-serverA. And ssh consumes 22% of one core of the CPU on client.[[BR]]

tahoe-lafs seems to be ~8x slower on a point to point transfer over my lan than ssh is."	defect	new	normal	undecided	code	1.9.2		performance download