On Mon, 11 Nov 2002 jw schultz wrote:
> You haven't really provided enough data to even guess what
> is limiting your performance.
As I said in the last mail: One limit for sure is ssh.
But: with arcfour I'm getting 18 MB/s and that's where
rsync is actually starting. It's just getting down and
down and that's the strange point.
> You need look at CPU utilization, I/O load and network load
The CPU is at 100% for encryption reasons of ssh. But I/O
is not very much.
> Is the 18MB/s actual data transfer (just what has changed)
> during actual transfer? If so you may be up against the
> limitation of your disk+file systems.
The disks have an upper limit of 52 MB/s (ext2) respectively
45 MB/s (ext3). It's an IDE RAID with 12 WD disks.
> My gut reaction is that 18MB/s is probably just short of the
> best sustained throughput you can get out of your disk
Nope. The average of the disks over a long period is between
31 and 38 MB/s. I tested it without ssh.
Just to say it again: I wouldn't have a problem with 18 MB/s,
that's what I expected. I just have a problem with the fact
that it goes down to 400 KB/s in half an hour...:-(
Mermgfurt,
Udo
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