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Subject: Re: [gentoo-user] Network throughput from main Gentoo rig to NAS box.
To: gentoo-user@lists.gentoo.org
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From: ralfconn <mentadent47@yahoo.com>
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On 9/23/23 14:04, Dale wrote:
> Howdy,
>
> As most everyone knows, I redone my NAS box. Before I had Truenas on it
> but switched to Ubuntu server thingy called Jimmy. Kinda like the
> name. lol Anyway, Ubuntu has the same odd transfer pattern as the
> Truenas box had. I'm not sure if the problem is on the Gentoo end or
> the Ubuntu end or something else. I'm attaching a picture of Gkrellm so
> you can see what I'm talking about. It transfers a bit, then seems to
> stop for some reason, then start up again and this repeats over and
> over. I'm expecting more of a consistent throughput instead of all the
> idle time. The final throughput is only around 29.32MB/s according to
> info from rsync. If it was not stopping all the time and passing data
> through all the time, I think that would improve. Might even double.
>
> ...
> Has anyone ever seen something like this and know why it is idle for so
> much of the time? Anyone know if this can be fixed so that it is more
> consistent, and hopefully faster?
>
I found a similar pattern when I checked some time ago, while
transferring big (several Gb) files from one desktop to the other. I
concluded the cause of the gaps was the destination PC's SATA spinning
disk that needed to empty its cache before accepting more data. In
theory the network is 1Gb/s (measured with iperf, it is really close to
that) and the SATA is 6Gb/s so it should not be the limit, but I have
strong doubts as how this speed is measured by the manufacturer. As
indirect confirmation, when I switched the destination disk to a flash
one the overall network transfer speed improved a lot (a lot lot!).
raffaele