Re: kern/57558: pgdaemon 100% busy - no scanning (ZFS case)

[Chuck Silvers <chuq%chuq.com@localhost>]

The following reply was made to PR kern/57558; it has been noted by GNATS.

From: Chuck Silvers <chuq%chuq.com@localhost>
To: Frank Kardel <kardel%netbsd.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost,
	netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/57558: pgdaemon 100% busy - no scanning (ZFS case)
Date: Thu, 9 May 2024 10:48:24 -0700

 great, thanks for testing.
 
 which other cases are you talking about?
 
 -Chuck
 
 
 On Thu, May 09, 2024 at 07:26:01PM +0200, Frank Kardel wrote:
 > Thanks for that simpler fix to avoid the starvation state. Test have shown
 > that that works in the
 > 
 > environment.
 > 
 > I am wondering, though, whether something needs to be done for the other
 > cases.
 > 
 > -Frank
 > 
 > 
 > On 05/06/24 08:05, Chuck Silvers wrote:
 > > [snip]
 > > I think the right fix for this is to increase the amount of kmem space that we
 > > allocate such that all of physical memory can be allocated as kmem without
 > > the pagedaemon considering the system to be starved for kmem virtual space.
 > > this means allocating an enough kmem space for 10/9 of physical memory,
 > > so that even though only 9/10 of kmem virtual space can be used, there is still
 > > enough kmem virtual space available for all of physical memory.
 > > 
 > > please try the attached patch.
 > > 
 > > -Chuck