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Re: Debian server for backups of Windows clients



Hi, Celejar

On 09/09/16 18:18, Celejar wrote:

>>>> My laptop has 802.11 a/b/g WiFi and Fast Ethernet.  Wireless data
>>>> transfers are slow (~50 Mbps).  Wired is twice as fast (100 Mbps); still
>>>> slow.  Newer WiFi (n, ac) should be faster, but only the newest WiFi
>>>> hardware can match or beat Gigabit.

>>> You get ~50Mbps over a/b/g? 54Mbps is the theoretical maximum, and
>>> everything I've read says that 20-24Mbps is the real-world maximum.

>> Still, 20-24 Mbps is more than 10 Mpbs I was seeing with rsync. There
>> could be a bottleneck somewhere?

> As per your own suggestion in another message, definitely benchmark
> with iperf to see if that's better.

Yes, it can be. I was thinking about what I said in a previous message
about the control information added by rsync on the packets sent.

I think this would be important only if we focus on the performance
(number of bits of data sent / total number of bits sent). In this case,
the focus is the transfer rate, for which the amount of control bits
used would be irrelevant since I think we need to know how many bits per
second we are getting, regardless of the utility have those bits.

> And as we discussed in another thread some time ago, (especially) if 
> you're using wireless, benchmark throughput in *both* directions,
> since the transmitter (or receiver) may be better on one machine than
> on another.

Interesting sidelight. Thanks for sharing.


Kind regards,
Daniel

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