Groups > linux.debian.user > #172029

Re: Debian server for backups of Windows clients

From	"Neal P. Murphy" <neal.p.murphy@alum.wpi.edu>
Newsgroups	linux.debian.user
Subject	Re: Debian server for backups of Windows clients
Date	2016-09-11 07:50 +0200
Message-ID	<sg5Op-244-1@gated-at.bofh.it> (permalink)
References	<s1Pgt-1Bc-21@gated-at.bofh.it> <sfRs5-1mE-1@gated-at.bofh.it> <sfRLr-1tp-3@gated-at.bofh.it> <sfRV7-1wK-7@gated-at.bofh.it>
Organization	Murphy Retirement Home

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On Sat, 10 Sep 2016 10:53:20 -0400
rhkramer@gmail.com wrote:

> On Saturday, September 10, 2016 10:40:26 AM Gene Heskett wrote:
> > On Saturday 10 September 2016 10:26:15 rhkramer@gmail.com wrote:
> > > On Saturday, September 10, 2016 08:41:53 AM Dan Ritter wrote:
> > > > It's in megabytes per second, so assume 1000/8 = 250 MB/s is the
> > > > bandwidth of a gigabit ethernet NIC.
> > > 
> > > Sorry, I tend to pick at nits, but, for the record, 1000/8 is 125
> > > Mb/s.  It doesn't (really) change your conclusions.
> > > 
> > > regards,
> > > Randy Kramer
> > 
> > You make an assumption many folks do, but theres a start bit and a stop
> > bit so the math is more like 1000/10=100 Mb/s.
> 
> 
> Well, 1000/8 is still 125 ;-) but I wouldn't have written back just to say 
> that.  Isn't it the case that there is something less than 1 start and 1 stop 
> for every byte--maybe like 1 stop bit for every several bytes?  (I am just 
> (slightly) curious.)
> 
> And, iirc, there are variations (which may be obsolete--I seem to remember one 
> protocol that had either 2 start or 2 stop bits?

Start/stop bits apply to async TIA-232.

Speaking very generally, 100Mb/s Ethernet actually operates at 125Mb/s; that includes the LAPB-like protocol that actually transmits the packets. All the layer 1 overhead goes in that extra 25Mb/s.

So, more correctly, you have data + TCP + IP overhead + L2 overhead: around 3% for full packets, higher for smaller packets. This is why 100Mb/s ethernet saturates at around 92%-95% *data* transmission. The rest is protocol overhead and delays (probably akin to RR and RNR).

Thread

Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-08-02 23:20 +0200
  Re: Debian server for backups of Windows clients David Christensen <dpchrist@holgerdanske.com> - 2016-08-03 05:30 +0200
    Re: Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-08-08 20:30 +0200
      Re: Debian server for backups of Windows clients David Christensen <dpchrist@holgerdanske.com> - 2016-08-09 05:30 +0200
        Re: Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-08-10 01:30 +0200
          Re: Debian server for backups of Windows clients David Christensen <dpchrist@holgerdanske.com> - 2016-08-10 04:00 +0200
            Re: Debian server for backups of Windows clients Celejar <celejar@gmail.com> - 2016-09-09 21:00 +0200
              Re: Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-09-09 21:50 +0200
                Re: Debian server for backups of Windows clients Celejar <celejar@gmail.com> - 2016-09-09 23:20 +0200
                Re: Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-09-11 14:30 +0200
                Re: Debian server for backups of Windows clients deloptes <deloptes@gmail.com> - 2016-09-10 00:10 +0200
                Re: Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-09-11 14:10 +0200
              Re: Debian server for backups of Windows clients David Christensen <dpchrist@holgerdanske.com> - 2016-09-10 05:40 +0200
                Re: Debian server for backups of Windows clients David Wright <deblis@lionunicorn.co.uk> - 2016-09-10 06:20 +0200
                Re: Debian server for backups of Windows clients "Neal P. Murphy" <neal.p.murphy@alum.wpi.edu> - 2016-09-10 07:30 +0200
                Re: Debian server for backups of Windows clients Dan Ritter <dsr@randomstring.org> - 2016-09-10 14:50 +0200
                Re: Debian server for backups of Windows clients rhkramer@gmail.com - 2016-09-10 16:30 +0200
                Re: Debian server for backups of Windows clients Gene Heskett <gheskett@shentel.net> - 2016-09-10 16:50 +0200
                Re: Debian server for backups of Windows clients rhkramer@gmail.com - 2016-09-10 17:00 +0200
                Re: Debian server for backups of Windows clients David Christensen <dpchrist@holgerdanske.com> - 2016-09-10 17:40 +0200
                Re: Debian server for backups of Windows clients Gene Heskett <gheskett@shentel.net> - 2016-09-10 19:40 +0200
                Re: Debian server for backups of Windows clients "Neal P. Murphy" <neal.p.murphy@alum.wpi.edu> - 2016-09-11 07:50 +0200
                Re: Debian server for backups of Windows clients David Christensen <dpchrist@holgerdanske.com> - 2016-09-10 08:20 +0200
                Re: Debian server for backups of Windows clients Celejar <celejar@gmail.com> - 2016-09-11 04:30 +0200
            Re: Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-09-09 21:50 +0200
              Re: Debian server for backups of Windows clients David Christensen <dpchrist@holgerdanske.com> - 2016-09-10 05:50 +0200
                Re: Debian server for backups of Windows clients Celejar <celejar@gmail.com> - 2016-09-11 04:30 +0200
                Re: Debian server for backups of Windows clients David Christensen <dpchrist@holgerdanske.com> - 2016-09-11 05:10 +0200
  Re: Debian server for backups of Windows clients didier gaumet <didier.gaumet@gmail.com> - 2016-08-03 10:40 +0200
    Re: Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-08-10 01:40 +0200
      Re: Debian server for backups of Windows clients didier gaumet <didier.gaumet@gmail.com> - 2016-08-11 18:50 +0200
        Re: Debian server for backups of Windows clients didier gaumet <didier.gaumet@gmail.com> - 2016-08-11 19:00 +0200
  Re: Debian server for backups of Windows clients Darac Marjal <mailinglist@darac.org.uk> - 2016-08-08 11:10 +0200
    Re: Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-08-08 22:10 +0200
      Re: Debian server for backups of Windows clients David Christensen <dpchrist@holgerdanske.com> - 2016-08-09 05:30 +0200
        Re: Debian server for backups of Windows clients Mike McGinn <mikemcginn@mcginnweb.net> - 2016-08-09 15:40 +0200
    Re: Debian server for backups of Windows clients Glenn English <ghe@slsware.net> - 2016-08-08 23:40 +0200
      Re: Debian server for backups of Windows clients Daniel Bareiro <daniel-listas@gmx.net> - 2016-08-09 03:20 +0200
  Re: Debian server for backups of Windows clients Joel Wirāmu Pauling <joel@aenertia.net> - 2016-08-10 02:20 +0200

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