Re: [uml-devel] [PATCH] I/O-Request Token Bucket Limiter

["roland" <for_spam@gmx.de>]

thanks for explanation!

that`s a great feature :)

is it (generally) possible to have something similar for cpu or other "ressources" like network bandwidth , too?

regards
roland


----- Original Message ----- 
From: "Christopher S. Aker" <caker@theshore.net>
To: "roland" <for_spam@gmx.de>; "uml-devel" <user-mode-linux-devel@lists.sourceforge.net>
Sent: Sunday, March 28, 2004 3:41 PM
Subject: Re: [uml-devel] [PATCH] I/O-Request Token Bucket Limiter


> > hello christoph,
> > could you please explain (in a simple way), what your patch can be used for?
> > from my point of understanding, we now can limit the maximum i/o bandwidth a
> single uml can use?
> > is that right?
> > i have difficulties in understanding the meaning of token/bucket/filter.
> 
> It allows you to place a limit on the amount of disk I/O that makes it to the host
> from each UML.  It is useful in the case where a mis-configured UML is thrashing
> its swapfile, and in turn consuming a lot of I/O on the host and starving the
> other UMLs of precious disk time.
> 
> The useful thing about the TBF is that it allows an initial burstable,
> unrestricted rate until the token bucket is empty.  The variable token_max (the
> size of the bucket) becomes how much "burstable" I/O to provide to the UML before
> it starts limiting the rate.  Each I/O request takes one token from io_tokens, but
> every second token_refill is added to io_tokens (to a maximum of token_max).
> 
> A way to see this is in action is to apply the patch, run the UML, and then on the
> host:
> 
> [root@host ~]# watch "uml_mconsole /path/to/mconsole/socket io_status 2>/dev/null
> "
> 
> And then:
> 
> [user@uml ~] dd if=/dev/zero of=/bigfile bs=1M count=200
> (or some other I/O generating activity)
> 
> and watch the mconsole io_status output...
> 
> -Chris
> 
> 
> 
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