Re: port-evbarm/53308 (evbarm-earmv7hf performance regression under qemu)

[Andreas Gustafsson <gson%NetBSD.org@localhost>]

The following reply was made to PR port-evbarm/53308; it has been noted by GNATS.

From: Andreas Gustafsson <gson%NetBSD.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: port-evbarm/53308 (evbarm-earmv7hf performance regression under qemu)
Date: Tue, 29 May 2018 10:23:55 +0300

 Joerg wrote on port-arm:
 > You can check your system with "vmstat -e | grep gtmr":
 > 
 > armgtmr0 CNTV_TVAL write retry max       8    0 misc
 > armgtmr0 CNTV_CVAL read retry max        1    0 misc
 > armgtmr0 CNTVCT read retry max           5    0 misc
 > armgtmr0 CNTPCT read retry max           6    0 misc
 
 armv7# vmstat -e | grep gtmr
 armgtmr0 CNTV_TVAL write retry max     201    0 misc
 armgtmr0 CNTV_CVAL read retry max        1    0 misc
 armgtmr0 CNTVCT read retry max         200    0 misc
 armgtmr0 CNTPCT read retry max         200    0 misc
 
 This is from qemu 2.11.1 with the following command line:
 
 qemu-system-arm -m \
     128 \
     -drive \
     file=/bracket/evbarm-earmv7hf/test/2018.05.27.17.16.39/anita/wd0.img,format=raw,media=disk,snapshot=on,if=sd \
     -nographic \
     -drive \
     file=/bracket/evbarm-earmv7hf/test/2018.05.27.17.16.39/anita/tests-results.img,format=raw,media=disk,snapshot=off \
     -tb-size \
     128 \
     -M \
     vexpress-a15 \
     -kernel \
     /bracket/evbarm-earmv7hf/test/2018.05.27.17.16.39/anita/netbsd-VEXPRESS_A15.ub \
     -append \
     root=ld0a \
     -dtb \
     /usr/pkg/share/dtb/arm/vexpress-v2p-ca15-tc1.dtb
 
 -- 
 Andreas Gustafsson, gson%NetBSD.org@localhost