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From "Bert Huijben" <b...@qqmail.nl>
Subject RE: svn commit: r1465647 - /subversion/site/publish/docs/release-notes/1.8.html
Date Mon, 08 Apr 2013 16:00:23 GMT


> -----Original Message-----
> From: stefan2@apache.org [mailto:stefan2@apache.org]
> Sent: maandag 8 april 2013 16:11
> To: commits@subversion.apache.org
> Subject: svn commit: r1465647 - /subversion/site/publish/docs/release-
> notes/1.8.html
> 
> Author: stefan2
> Date: Mon Apr  8 14:11:21 2013
> New Revision: 1465647
> 
> URL: http://svn.apache.org/r1465647
> Log:
> Update the release notes in light of r1465622.  We will no longer
> time out in zero-copy mode but naive use of this option will still
> have adverse effects on quality of service.
> 
> * publish/docs/release-notes/1.8.html
>   (svnserve): replace the bit about timeouts;
>               add a note about cache dependency
> 
> Modified:
>     subversion/site/publish/docs/release-notes/1.8.html
> 
> Modified: subversion/site/publish/docs/release-notes/1.8.html
> URL: http://svn.apache.org/viewvc/subversion/site/publish/docs/release-
> notes/1.8.html?rev=1465647&r1=1465646&r2=1465647&view=diff
> ==========================================================
> ====================
> --- subversion/site/publish/docs/release-notes/1.8.html (original)
> +++ subversion/site/publish/docs/release-notes/1.8.html Mon Apr  8
> 14:11:21 2013
> @@ -1560,13 +1560,16 @@ CPU load. Future clients may be able, ho
>  </p>
> 
>  <p>When the server is given the <tt>--client-speed N</tt> parameter,
> -it will assume that <tt>all</tt> clients are able to process data rates
> -of N Gbit/s; N being a non-negative integer. With N&gt;0, the server will
> +it will assume that most clients are able to process data at rates of
> +N Gbit/s; N being a non-negative integer. With N&gt;0, the server will
>  take various shortcuts to reduce internal processing overhead. On the
> -downside, it must employ strict time-outs to prevent clients from
> -interfering with each other: In any 1 second interval, a client must process
> -incoming data with at least 2% of the specified speed - or the server
> -may time out and abort the operation.
> +downside, a hanging client may cause server performance to degrade for
> +other clients. Setting N to values above 100 is legal but will often
> +result in a net performance loss.
> +</p>

Would it help if we would use Mbit here, to allow other types of improvements later?

In general I'm committing over the internet and I don't think these speeds make any sense
here in the forseeable future, while I could see us optimizing between ADSL (1-20 Mbit down,
0.25-4 up) and fiber (20-300 Mbit synchronous) in future versions.

I don't see a more than one GBit connection to a server anywhere in sight for workstations,
except for very specific network setups. (Server-server might go to 10 Gbit/s in the near
future, but that is not a common workstation scenario)

If we switch to Mbits/s as value we should still be able to talk about more than a Pbit/s
using a normal integer.

	Bert


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