Subject: Re: disk caching
To: Thor Lancelot Simon <>
From: None <>
List: tech-kern
Date: 04/13/2000 22:36:56
On Thu, Apr 13, 2000 at 10:49:19PM -0400, Thor Lancelot Simon wrote:
> On Thu, Apr 13, 2000 at 10:38:50PM +0200, Manuel Bouyer wrote:
> There are some very common cases which are pathological for the algorithm
> we have in that its performance degrades to that of the old "flush all
> buffers every 30 seconds of wall-clock time" method.  For example, if
> you have a system that does most of its I/O to a single file... you lose.
> On the other hand, the "right" way is pretty hard to do with UBC.  What
> do you do, attach a timeval to every page?
	How about if you place individual buffers instead of vnodes in the
syncer's work list?  And add a VOP_FSYNCBUF which only flushed the specified