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100Mbps Enet is very slow - how to debug?

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  #1 (permalink)  
Old 08-16-2008
Steve
 

Posts: n/a
100Mbps Enet is very slow - how to debug?
WinXP desktop and Vista laptop, connected via Enet ADSL modem+switch.
Backing up to the desktop takes many hours even tho it's only a 160GB disk
less than half full.

Network utilisation is at about 0.2%. Can this be right? I've tried
resetting network adapters to default, swapping cables, etc. etc. Should I
try a new switch? What else can I try? Renewing everything networkish and
going wireless at the same time seems a bit drastic..

Ideas?
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  #2 (permalink)  
Old 08-16-2008
Jack \(MVP-Networking\).
 

Posts: n/a
Re: 100Mbps Enet is very slow - how to debug?
Hi'
Do you have a combo Modem/Router, or you are backing up through the
Internet.
If the IPs of the computers are Not local (the 192.168.xxx.xxx) type, it
means that you do not have a Local Network, and the backing up is done at
Internet "Speed".
As a frame of reference, http://www.ezlan.net/net_speed.html
Jack (MS, MVP-Networking)

"Steve" <Steve@discussions.microsoft.com> wrote in message
news:9DF11A5A-91FD-4CC7-83CF-907E5CFBB238@microsoft.com...
> WinXP desktop and Vista laptop, connected via Enet ADSL modem+switch.
> Backing up to the desktop takes many hours even tho it's only a 160GB disk
> less than half full.
>
> Network utilisation is at about 0.2%. Can this be right? I've tried
> resetting network adapters to default, swapping cables, etc. etc. Should
> I
> try a new switch? What else can I try? Renewing everything networkish and
> going wireless at the same time seems a bit drastic..
>
> Ideas?


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  #3 (permalink)  
Old 08-16-2008
Steve
 

Posts: n/a
Re: 100Mbps Enet is very slow - how to debug?
I am using the local connection - it's a Zyxel P660H with latest firmware,
integrated 4 port switch. Addrs. 192.168.1.33 & .35, everything shows it
should be running at 100Mbps.

I've seen some posts here about using "netsh" to turn off a Vista autoconfig
TCP parameter. I'll try that next, but it's not really satisfactory that
Vista autoconfigs to something well nigh useless, is it......

"Jack (MVP-Networking)." wrote:

> Hi'
> Do you have a combo Modem/Router, or you are backing up through the
> Internet.
> If the IPs of the computers are Not local (the 192.168.xxx.xxx) type, it
> means that you do not have a Local Network, and the backing up is done at
> Internet "Speed".
> As a frame of reference, http://www.ezlan.net/net_speed.html
> Jack (MS, MVP-Networking)
>
> "Steve" <Steve@discussions.microsoft.com> wrote in message
> news:9DF11A5A-91FD-4CC7-83CF-907E5CFBB238@microsoft.com...
> > WinXP desktop and Vista laptop, connected via Enet ADSL modem+switch.
> > Backing up to the desktop takes many hours even tho it's only a 160GB disk
> > less than half full.
> >
> > Network utilisation is at about 0.2%. Can this be right? I've tried
> > resetting network adapters to default, swapping cables, etc. etc. Should
> > I
> > try a new switch? What else can I try? Renewing everything networkish and
> > going wireless at the same time seems a bit drastic..
> >
> > Ideas?

>
>

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  #4 (permalink)  
Old 08-16-2008
Bob Moore
 

Posts: n/a
Re: 100Mbps Enet is very slow - how to debug?
On Sat, 16 Aug 2008 04:53:01 -0700, Steve wrote:

>Backing up to the desktop takes many hours even tho it's only a 160GB disk
>less than half full.


I've seen this a couple of times and our resident network guru told me
it's sometimes due to auto-config 10/100 cards "hunting". Try forcing
the network cards on both machines to a single speed/duplex setting
and retry your transfer.

Government Health Warning: Just because I code sockets programs
doesn't mean I'm an expert on networks. I may just be smoking dope,
but it's worked for me in the past.

--
Bob Moore
http://bobmoore.mvps.org/
(this is a non-commercial site and does not accept advertising)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
Do not reply via email unless specifically requested to do so.
Unsolicited email is NOT welcome and will go unanswered.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
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  #5 (permalink)  
Old 08-17-2008
Steve
 

Posts: n/a
Re: 100Mbps Enet is very slow - how to debug?
Setting both adapters to 100Mbps half-duplex certainly improved performance.
Thanks.

"Bob Moore" wrote:

> On Sat, 16 Aug 2008 04:53:01 -0700, Steve wrote:
>
> >Backing up to the desktop takes many hours even tho it's only a 160GB disk
> >less than half full.

>
> I've seen this a couple of times and our resident network guru told me
> it's sometimes due to auto-config 10/100 cards "hunting". Try forcing
> the network cards on both machines to a single speed/duplex setting
> and retry your transfer.
>
> Government Health Warning: Just because I code sockets programs
> doesn't mean I'm an expert on networks. I may just be smoking dope,
> but it's worked for me in the past.
>
> --
> Bob Moore
> http://bobmoore.mvps.org/
> (this is a non-commercial site and does not accept advertising)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
> Do not reply via email unless specifically requested to do so.
> Unsolicited email is NOT welcome and will go unanswered.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
>

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