Re: kern/56309 (swapctl -U is very inefficient (takes ages to eternities))

[Frank Kardel <kardel%kardel.name@localhost>]

The following reply was made to PR kern/56309; it has been noted by GNATS.

From: Frank Kardel <kardel%kardel.name@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/56309 (swapctl -U is very inefficient (takes ages to
 eternities))
Date: Sat, 3 Aug 2024 20:55:38 +0200

 Thanks for looking into it.
 
 I think there may be additional factors. Synchronous reads do not 
 explain high cpu usage and low transfer rates.
 
 Somewhere, I believe, there seems to be a computationally expensive path 
 (may due to using parts of the fault logic).
 
 If it were only synchronous reads and backwards reading I would expect 
 low cpu usage and almost 100% disk utilization, but that is not what I 
 have seen.
 
 Frank