On Mon, Jul 26, 2021 at 11:56:13PM +0900, Izumi Tsutsui wrote: > > NetBSD 9.2, amd64, 16GiB RAM, quad core + hyperthreading. > > > > I've repeatedly noticed an issue where a large amount of disk reads can > > result in lost keystrokes, jerky mouse behaviour and other weirdness. > : > > "vmstat 1" during these events shows climbing runqueue, falling free > > memory, high reclaim rate, very high scan rate, and 8 CPUs worth of > > system time - and I hear the BIOS spinning up the CPU fan. > > What "vmstat -m" shows? > > if kmem-160 (or kmem-192) has a large number, maybe caused by > radeondrmkms(4) leaks. > https://mail-index.netbsd.org/netbsd-bugs/2021/07/12/msg072460.html
No, no radeon here. To be clear, I don't believe this is a leak. It's just some intermittently poor behaviour during high cache churn. ksh$ vmstat -m | sort -k 8nr | head vcachepl 336 61562054 0 60809350 2819365 2720482 98883 258691 0 inf 0 buf2k 2048 2710812 0 2543840 1224274 1136951 87323 116413 1 1 0 ffsdino2 256 60933737 0 60181639 1907605 1823135 84470 193820 0 inf 0 ffsino 256 60879348 0 60127246 1906802 1823012 83790 193820 0 inf 0 anonpl 32 38306110 0 35856325 43412 3062 40350 42502 0 inf 0 ncache 192 12485490 0 11813042 39948 122 39826 39828 0 inf 0 mutex 64 59812492 0 58941710 200286 164419 35867 51528 0 inf 0 bufpl 296 2450252 0 2210437 136128 114245 21883 24008 0 inf 381 buf16k 16384 1046417 0 983052 143815 126570 17245 22064 1 1 0 kmem-2048 2048 186643 2 169723 35112 26265 8847 12270 0 inf 1 'systat vm' shows the system mostly stalled with high sys CPU%, doing page scans: 18 users Load 6.98 3.39 2.35 Tue Jul 27 09:21:44 Proc:r d s Csw Traps SysCal Intr Soft Fault PAGING SWAPPING 18 1230 1215 58 4060 978 953 58 in out in out ops 82.7% Sy 0.5% Us 0.0% Ni 4.4% In 12.4% Id pages | | | | | | | | | | | =========================================>%% forks fkppw Anon 8904872 54% zero 8928 1362 Interrupts fksvm Exec 457148 2% wired 450292 284 TLB shootdown pwait File 3286872 20% inact 2338880 100 cpu0 timer relck Meta 1371982 % bufs 234364 4 ioapic0 pin 18 rlkok (kB) real swaponly free 906 ioapic0 pin 16 noram Active 9859004 1745392 10128 ioapic0 pin 23 3 ndcpy Namei Sys-cache Proc-cache 68 msi1 vec 0 1 fltcp Calls hits % hits % 22 zfod 236 234 99 cow 2048 fmin Disks: seeks xfers bytes %busy 2730 ftarg wd0 20 253K 14.3 itarg wd1 18 242K 13.1 flnan cd0 29 pdfre cd1 1180584 pdscn sd0 1 91K 0.2 raid0 21 273K 33.4 -- Paul Ripke "Great minds discuss ideas, average minds discuss events, small minds discuss people." -- Disputed: Often attributed to Eleanor Roosevelt. 1948.