Re: i/o scheduling (was Re: NEW_BUFQ_STRATEGY)

Daniel Carosone <[email protected]>
Newsgroups gmane.os.netbsd.devel.performance,gmane.os.netbsd.devel.kernel
Message-ID <[email protected]> 
On Thu, Dec 18, 2003 at 07:50:37AM +0900, YAMAMOTO Takashi wrote:
> my understanding is,
> - page is PG_BUSY during write back.  if we keep a delayed write
>   request at buffer queue forever, the page will be left PG_BUSY forever.
> - getpages will wait on the PG_BUSY page.

This sounds like it could already be causing noticable
performance/concurrency issues, even without extra delays?

--
Dan.
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