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xen-devel
Re: [Xen-devel] Interrupt levels
Digging into this a little more.
Once I've shut down domUs and a lot of the services (including xend) on
dom0, the interrupt level is unchanged and still high.
nic@stateless:~$ vmstat 3
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 0 98512 104 21328 0 0 53 16 71426 49 0 1 97 1
0 0 0 98520 104 21328 0 0 0 1 183415 16 0 0 100 0
0 0 0 98520 104 21328 0 0 0 0 185419 10 0 0 100 0
0 0 0 98520 104 21328 0 0 0 0 183671 12 0 0 100 0
0 0 0 97872 104 21328 0 0 0 67 170898 47 0 0 100 0
....
So obiovusly the domUs aren't causing the problem.
In fact in a new rebooted machine with hardly anything running the same
is occuring. Seems like some spinlock out of control.
Now if I start compiling xen (make in xen-2.0bk) the following occurs:
nic@stateless:~$ vmstat 3
....
0 1 0 3296 32 102832 0 0 2653 53 73099 658 20 17 11 53
0 1 0 3168 32 101036 0 0 839 5092 71982 558 26 25 5 45
3 1 0 3616 32 97076 0 0 5101 139 36210 811 32 37 2 29
0 1 0 26904 32 95108 0 0 1665 263 67692 832 27 25 3 45
0 1 0 8408 32 99000 0 0 1297 129 55256 399 26 13 8 53
0 1 0 4696 32 98140 0 0 396 83 22446 277 57 19 4 20
1 0 0 3416 32 98476 0 0 795 1169 88617 436 22 12 4 62
1 0 0 19800 32 91668 0 0 364 21 18907 178 65 23 0 12
1 0 0 22552 32 88176 0 0 424 470 14323 204 65 23 1 11
1 0 0 23768 32 86052 0 0 140 283 3218 181 77 19 0 4
1 0 0 35736 32 86260 0 0 28 244 215 119 71 27 0 2
1 0 0 22040 32 86572 0 0 71 475 14472 148 72 17 4 7
3 0 0 21216 32 86272 0 0 85 55 592 239 67 32 0 1
1 0 0 18528 32 86452 0 0 31 1238 19669 131 59 29 10 2
1 0 0 16816 32 86988 0 0 79 4721 9065 106 66 25 1 8
1 0 0 15664 32 81284 0 0 16 43 1786 93 79 20 0 1
1 0 0 26048 32 81452 0 0 25 53 325 81 71 29 0 0
1 0 0 17616 32 81624 0 0 33 21 1337 115 87 13 0 1
1 0 0 41056 32 77984 0 0 73 326 1898 140 79 18 0 2
1 0 0 25248 32 78144 0 0 32 233 503 87 87 13 0 1
1 0 0 33832 32 78304 0 0 19 11 116 58 78 22 0 0
1 0 0 45736 32 78532 0 0 43 114 1477 75 80 18 0 1
1 0 0 40680 32 78760 0 0 43 32 215 63 78 22 0 0
1 0 0 29224 32 78924 0 0 25 162 250 88 79 21 0 1
1 0 0 39976 32 79124 0 0 29 269 5719 90 70 26 3 0
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 0 0 38816 32 80432 0 0 404 24 9220 119 68 22 1 9
1 0 0 16672 32 80984 0 0 32 90 2226 82 75 23 0 2
1 0 0 23840 32 81788 0 0 213 21 4700 106 75 18 0 7
1 0 0 31136 32 82100 0 0 52 98 3469 88 74 23 0 3
1 0 0 32288 32 82356 0 0 43 251 3546 123 76 22 0 2
Interrupts drop down:
nic@stateless:~$ diff -u interrupts.3 interrupts.4
--- interrupts.3 2005-03-09 00:37:51.000000000 +1300
+++ interrupts.4 2005-03-09 00:37:56.000000000 +1300
@@ -2,26 +2,26 @@
1: 9 Phys-irq i8042
8: 4 Phys-irq rtc
15: 11 Phys-irq ide1
- 22: 45384 Phys-irq ioc0
- 24: 82320 Phys-irq eth0
+ 22: 45707 Phys-irq ioc0
+ 24: 82403 Phys-irq eth0
128: 1 Dynamic-irq misdirect
129: 102 Dynamic-irq ctrl-if
-130: 121707669 Dynamic-irq timer
+130: 121719090 Dynamic-irq timer
131: 0 Dynamic-irq console
132: 0 Dynamic-irq net-be-dbg
-133: 724 Dynamic-irq blkif-backend
+133: 726 Dynamic-irq blkif-backend
134: 25 Dynamic-irq vif1.0
135: 177 Dynamic-irq vif1.1
-136: 2352 Dynamic-irq blkif-backend
-137: 4300 Dynamic-irq vif2.0
+136: 2586 Dynamic-irq blkif-backend
+137: 5008 Dynamic-irq vif2.0
138: 1 Dynamic-irq vif2.1
139: 1936 Dynamic-irq blkif-backend
140: 2 Dynamic-irq vif5.0
-141: 4439 Dynamic-irq vif5.1
+141: 5151 Dynamic-irq vif5.1
142: 626 Dynamic-irq blkif-backend
-143: 451 Dynamic-irq vif4.0
-144: 640 Dynamic-irq vif4.1
-145: 901 Dynamic-irq blkif-backend
+143: 452 Dynamic-irq vif4.0
+144: 641 Dynamic-irq vif4.1
+145: 904 Dynamic-irq blkif-backend
146: 3 Dynamic-irq vif6.0
147: 97 Dynamic-irq vif6.1
NMI: 0
then start back up with the compile job is completed:
1 0 0 29848 56 67280 0 0 452 203 6867 397 62 34 0 4
1 0 0 29208 56 67520 0 0 451 33 11491 382 51 43 1 4
2 0 0 32472 56 67664 0 0 399 205 3197 370 53 46 0 2
1 0 0 29528 56 67908 0 0 416 64 5640 354 43 53 0 4
1 0 0 31320 56 68396 0 0 328 218 1633 326 46 53 1 1
1 0 0 22488 56 68612 0 0 192 183 2367 215 57 40 2 1
1 0 0 24984 56 68688 0 0 1987 61 2169 186 40 59 0 1
1 0 0 29976 56 69716 0 0 1805 161 3892 292 45 53 2 0
1 0 0 28136 56 70052 0 0 1972 108 11184 318 40 54 1 5
1 0 0 27504 56 70256 0 0 2363 660 4377 305 31 66 1 2
1 0 0 28144 56 70360 0 0 2396 186 2604 273 29 68 1 2
1 0 0 22256 56 70512 0 0 2277 396 1514 254 31 67 0 2
1 0 0 31664 56 70640 0 0 1860 482 11381 245 23 70 0 6
3 0 0 34736 56 70972 0 0 408 133 10282 352 36 58 3 2
1 0 0 17200 56 80856 0 0 647 566 45363 510 40 31 8 22
0 1 0 3072 56 98700 0 0 521 2509 56155 453 49 16 20 16
0 0 0 2752 56 99360 0 0 109 152 173391 94 0 1 83 16
Seems like a bug to me.
Nicholas
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