Hi, On Sat, 27 May 2006, Ingo Juergensmann wrote:
> On Arrakis, one of my m68k buildds, I discovered recently that "top" shows a > quite high activity doing hardware interrupts: > > top - 13:57:09 up 1 day, 21:52, 3 users, load average: 0.10, 0.07, 0.01 > Tasks: 69 total, 1 running, 68 sleeping, 0 stopped, 0 zombie > Cpu(s): 0.6% us, 0.0% sy, 0.0% ni, 0.0% id, 0.0% wa, 99.4% hi, 0.0% si > Mem: 127340k total, 116048k used, 11292k free, 28372k buffers > Swap: 272192k total, 19532k used, 252660k free, 47608k cached > > This 99.4% hi seems to be something like an idle process counter as it drops > relative to CPU usage: This is what I get under 2.6.16: top - 23:47:49 up 51 min, 1 user, load average: 0.01, 0.14, 0.26 Tasks: 32 total, 1 running, 31 sleeping, 0 stopped, 0 zombie Cpu(s): 3.2% us, 1.9% sy, 0.0% ni, 94.3% id, 0.0% wa, 0.6% hi, 0.0% si > Cpu(s): 2.5% us, 0.0% sy, 68.1% ni, 0.0% id, 0.0% wa, 29.4% hi, 0.0% si > (vivaldi, another 060 m68k buildd) > > "vmstat 3" reports: > procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- > r b swpd free buff cache si so bi bo in cs us sy id wa > 0 1 19528 10144 28468 48024 0 0 12 21 192 34 55 45 0 0 > 0 0 19528 10084 28468 48024 0 0 0 0 424 23 1 99 0 0 > 0 0 19528 10084 28472 48024 0 0 0 11 415 26 6 94 0 0 > 0 0 19528 10084 28472 48024 0 0 0 0 408 20 0 100 0 0 > 0 0 19528 10084 28476 48024 0 0 0 4 410 21 0 100 0 0 > > So, roughly 400 interrups per timeframe. Due to chained interrupts most interrupts are counted twice, so you get at least the timer interrupt and vertical blank handler twice. It's maybe a little weird but normal. > Whereas on my PPC and i386 system: > > PPC: > top - 14:04:13 up 10 days, 18:30, 5 users, load average: 0.00, 0.09, 0.08 > Cpu(s): 0.9% us, 0.3% sy, 0.0% ni, 98.3% id, 0.1% wa, 0.2% hi, 0.2% si > > procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- > r b swpd free buff cache si so bi bo in cs us sy id wa > 1 0 86412 36496 20 138348 0 0 0 0 29 301 0 0 99 0 > 0 0 86412 36496 20 138348 0 0 0 0 41 376 1 1 98 0 > 0 0 86412 36496 20 138348 0 0 0 0 33 328 1 2 97 0 > 0 0 86412 36496 20 138348 0 0 0 4 21 269 1 1 98 0 I think on ppc clock interrupts are not counted here (there are not standard interrupts). > i386: > top - 14:11:32 up 49 days, 16:28, 9 users, load average: 0.03, 0.04, 0.00 > Cpu(s): 3.3% us, 1.5% sy, 0.0% ni, 94.7% id, 0.0% wa, 0.1% hi, 0.5% si > > procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- > r b swpd free buff cache si so bi bo in cs us sy id wa > 0 0 19976 6952 28 228936 0 0 3 0 7 9 3 1 95 0 > 0 0 19976 6952 28 228936 0 0 0 0 287 401 4 1 95 0 > 0 0 19976 6952 28 228936 0 0 0 6 285 404 4 3 93 0 > 0 0 19976 6920 28 228940 0 0 0 9 350 431 5 5 90 0 > 1 0 19976 6920 28 228940 0 0 0 5 319 417 5 4 91 0 That would be a kernel with HZ=250. bye, Roman -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
