Re: port-amd64/57266: Poor disk performance on VirtualBox vioscsi0 and NetBSD 10.0_BETA

[Bartek Krawczyk <bbartlomiej.mail%gmail.com@localhost>]

The following reply was made to PR port-amd64/57266; it has been noted by GNATS.

From: Bartek Krawczyk <bbartlomiej.mail%gmail.com@localhost>
To: gnats-bugs%netbsd.org@localhost, port-amd64-maintainer%netbsd.org@localhost,
 gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Cc: 
Subject: Re: port-amd64/57266: Poor disk performance on VirtualBox vioscsi0
 and NetBSD 10.0_BETA
Date: Sun, 12 Mar 2023 11:18:44 +0100

 On 12/03/2023 00:10, Michael van Elst wrote:
 > The following reply was made to PR port-amd64/57266; it has been noted by GNATS.
 > 
 > From: mlelstv%serpens.de@localhost (Michael van Elst)
 > To: gnats-bugs%netbsd.org@localhost
 > Cc:
 > Subject: Re: port-amd64/57266: Poor disk performance on VirtualBox vioscsi0 and NetBSD 10.0_BETA
 > Date: Sat, 11 Mar 2023 23:08:44 -0000 (UTC)
 > 
 >   bbartlomiej%gmail.com@localhost writes:
 >   
 >   >[  4197.011371] sd0(vioscsi0:0:0:0): adapter resource shortage
 >   >[  5134.201736] vioscsi0: autoconfiguration error: error reserving 35 (nsegs 18)
 >   
 >   vioscsi seems to allocate a too small queue, so it's "natural" to
 >   overflow it, and then that case isn't handled correctly by the
 >   driver.
 >   
 >   You should see a message like
 >   
 >     "cmd_per_lun %u qsize %d seg_max %u max_target %hu max_lun %u\n"
 >   
 >   The values come from VirtualBox. Can you please dump the values here?
 >   
 
 It shows:
 messages:Mar 12 11:06:11 netbsd /netbsd: [   1.0546101] vioscsi0: 
 cmd_per_lun 128 qsize 1024 seg_max 126 max_target 2 max_lun 1
 
 I haven't changed anything in default VirtualBox configuration except 
 for picking the virtio drivers for network and storage since I noticed 
 they're available. Today I tested with PIIX4 instead of virtio-scsi and 
 logs didn't show any errors but unpacking pkgsrc also took ~30min. The 
 VM has 12 vCPUs (Ryzen 9 3900x) and ~16GB of RAM assigned.
 
 -- 
 Regards
 Bartek Krawczyk