Re: kern/56291: XEN3_DOM0 nvme abysmal performance - very slow boot

[Joerg Sonnenberger <joerg%bec.de@localhost>]

The following reply was made to PR kern/56291; it has been noted by GNATS.

From: Joerg Sonnenberger <joerg%bec.de@localhost>
To: Frank Kardel <kardel%netbsd.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost,
	gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/56291: XEN3_DOM0 nvme abysmal performance - very slow boot
Date: Fri, 2 Jul 2021 13:30:30 +0200

 On Fri, Jul 02, 2021 at 10:53:23AM +0200, Frank Kardel wrote:
 > Yes, there seems to be trouble with interrupts overall.
 > 
 > Even without nvme the system is slow. (I had to boot with -a as the
 > 
 > root device was not recognized correctly - different issue):
 > 
 > Interrupts in a non Xen environment are at a rate of ~120. On Xen
 > 
 > without nvme they are around ~2100.
 > 
 > Seems that high interrupt rates occur with the bge driver (20 on an idle
 > interface (bge0), 800 on
 > 
 > an enabled interface (bge1))
 > 
 > The two files contain two sets of statistics 10 seconds apart.
 
 I wonder if the MSIX use is the problem.
 
 Joerg