Hi,
Had to reinstall a server that hosts xen domUs and noticed that the performance is pretty bad. I'm using dedicated LUNs for this domUs. Emulex HBA on a Proliant DL380G5. I don't remember what was the performance before, but within the domU the i/o wait is a show stopper.
Lun for a stopped domU:
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Code:
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asusis-xen1:~ # hdparm -t /dev/mapper/lun-domU-app
/dev/mapper/lun-domU-app:
Timing buffered disk reads: 48 MB in 3.18 seconds = 15.08 MB/sec |
This is vmstat while applying SLES10sp2 patches on a (idle other way) domU (notice the wait column):
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Code:
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procs -----------memory---------- ---swap-- -----io---- -system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
1 2 0 3025068 46208 271772 0 0 52 38 47 35 1 0 80 18 0
0 2 0 3024572 46212 272288 0 0 1 597 94 18 1 0 48 51 0
0 2 0 3006220 46312 289348 0 0 3 1708 398 359 8 2 52 37 0
0 2 0 3006096 46316 289344 0 0 1 640 78 7 0 0 47 53 0
0 2 0 3008824 46396 289784 0 0 1 1729 126 24 0 0 51 48 0
0 2 0 3007088 46396 290824 0 0 0 3407 163 19 0 0 48 51 0
0 2 0 3007088 46428 290792 0 0 0 4043 155 33 0 0 47 53 0
0 2 0 3007592 46428 290792 0 0 5 2400 164 17 0 0 52 48 0
0 2 0 3008152 46864 290876 0 0 17 4051 454 56 0 0 40 60 0
0 2 0 3008152 46864 290876 0 0 8 2745 232 30 0 0 58 42 0
0 2 0 3008092 46864 290876 0 0 3 1457 121 32 0 0 50 50 0
0 1 0 3008092 47120 290880 0 0 15 2113 122 40 0 0 48 52 0
0 2 0 3007728 47172 291088 0 0 64 16 105 38 0 0 51 49 0
0 1 0 3007236 47196 291584 0 0 123 11 83 33 0 0 49 51 0
0 1 0 3006996 47236 291804 0 0 80 29 91 43 0 0 52 48 0
0 1 0 3006764 47236 292064 0 0 89 0 81 48 0 0 48 52 0
0 1 0 3006584 47248 292052 0 0 51 4 69 32 0 0 47 53 0
0 1 0 3006588 47248 292312 0 0 52 0 63 30 0 0 53 47 0
0 1 0 3006228 47260 292560 0 0 120 4 83 66 0 0 40 60 0
0 1 0 3005988 47260 292820 0 0 79 0 67 46 0 0 58 42 0
0 1 0 3005868 47276 293064 0 0 33 5 57 24 0 0 38 63 0
procs -----------memory---------- ---swap-- -----io---- -system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
1 1 0 3005628 47276 293324 0 0 79 0 81 42 0 0 57 43 0
0 2 0 3005388 47288 293572 0 0 80 211 94 60 0 0 51 49 0
0 2 0 3005388 47288 293572 0 0 1 168 76 25 0 0 49 51 0
0 1 0 3005264 47308 293552 0 0 4 219 103 22 0 0 52 48 0
0 1 0 3001128 47328 295092 0 0 109 0 146 74 3 3 54 40 0
0 1 0 2998156 48036 296724 0 0 544 673 131 135 1 1 45 53 0
0 1 0 2995364 48040 299320 0 0 764 0 92 62 0 0 57 43 0
0 1 0 2995124 48180 299440 0 0 19 55 88 41 0 0 35 65 0
0 1 0 2995816 48184 299436 0 0 125 237 173 163 1 1 61 38 0
1 0 0 2986956 48428 305952 0 0 751 340 819 1722 2 14 59 25 0
1 0 0 2980152 48452 313208 0 0 428 0 598 1265 16 9 55 20 0
0 1 0 2983996 48940 306740 0 0 71 3569 378 214 30 1 56 14 0
0 1 0 2978240 48924 307276 0 0 180 0 215 286 0 3 48 49 0
0 1 0 2986656 49396 307064 0 0 72 89 298 382 2 4 53 41 0
1 0 0 2972316 49824 324836 0 0 126 510 1384 1066 8 7 55 30 0
1 0 0 2909960 50156 376764 0 0 77 0 1003 1208 36 5 50 9 0
0 2 0 2895264 50864 390096 0 0 9 20721 979 551 12 6 50 32 0
3 0 0 2891340 51100 394280 0 0 67 566 599 1115 3 9 55 33 0
1 1 0 2884516 51552 400068 0 0 0 2856 1188 2161 26 14 61 0 0
1 1 0 2893820 51728 391832 0 0 92 585 693 781 26 9 49 16 0
0 1 0 2893880 52328 397472 0 0 313 1324 668 815 11 8 56 25 0
procs -----------memory---------- ---swap-- -----io---- -system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
1 1 0 2886980 52356 404464 0 0 2247 0 112 54 0 0 50 50 0
0 1 0 2879832 52668 411172 0 0 2216 1237 186 62 0 0 47 53 0
0 1 0 2878288 52672 412728 0 0 512 0 49 20 0 0 52 48 0
0 1 0 2875260 52752 415768 0 0 993 164 92 27 0 0 48 52 0
0 1 0 2875020 52752 416028 0 0 68 0 68 11 0 0 47 53 0
0 2 0 2873692 52896 417184 0 0 353 1460 67 27 0 0 56 44 0
0 2 0 2873692 52896 417184 0 0 0 177 70 25 0 0 35 65 0
0 2 0 2873692 52896 417184 0 0 0 42 73 29 0 0 58 42 0
0 2 0 2873692 52896 417184 0 0 0 37 66 25 0 0 50 50 0
0 2 0 2873452 52896 417444 0 0 63 139 84 27 0 0 48 52 0
0 2 0 2872908 53016 417844 0 0 143 291 146 32 0 0 53 47 0
0 1 0 2868284 53032 421988 0 0 1351 149 131 36 0 0 47 53 0
0 2 0 2864440 53216 425964 0 0 1335 1942 174 40 0 0 52 48 0
0 1 0 2863416 53216 427004 0 0 289 812 178 30 0 0 48 52 0
0 1 0 2861732 53316 428464 0 0 519 31 96 21 0 0 46 54 0
0 1 0 2856396 53332 433908 0 0 1797 0 83 29 0 0 56 44 0
0 1 0 2851948 53516 438144 0 0 1384 57 78 28 0 0 35 65 0
0 2 0 2844796 53712 444968 0 0 2236 64 104 37 0 0 59 41 0
0 1 0 2840536 53720 449120 0 0 1401 1 70 23 0 0 37 63 0
0 1 0 2835188 53880 454420 0 0 1677 52 93 24 0 0 57 43 0
0 1 0 2830084 53884 459356 0 0 1631 0 81 22 0 0 53 47 0
procs -----------memory---------- ---swap-- -----io---- -system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
1 1 0 2825156 54036 463884 0 0 1488 170 130 36 0 0 47 53 0
0 1 0 2821068 54060 467760 0 0 1231 0 69 26 0 0 52 48 0
0 1 0 2814816 54428 473632 0 0 1947 104 103 47 0 0 48 52 0
0 1 0 2810552 54444 477776 0 0 1377 0 65 25 0 0 46 54 0
0 1 0 2798480 54612 489568 0 0 3833 53 109 56 0 0 56 44 0
0 1 0 2787720 54960 500140 0 0 3487 115 130 120 0 1 35 64 0
0 1 0 2780472 54992 507388 0 0 2295 0 102 50 0 0 59 41 0
0 1 0 2774096 55764 512596 0 0 1733 311 201 102 2 3 52 43 0
0 1 0 2773116 55856 513284 0 0 39 63 219 124 6 6 45 42 0
0 2 0 2771760 56860 513580 0 0 29 463 74 44 0 0 53 47 0
0 2 0 2771776 56864 513576 0 0 1 0 54 16 0 0 47 53 0
0 0 0 2809264 56948 475532 0 0 5 271 180 41 20 2 54 24 0
0 0 0 2809264 56948 475532 0 0 0 0 33 4 0 0 100 0 0
0 0 0 2808908 57296 475184 0 0 0 161 59 12 0 0 100 0 0
0 0 0 2808908 57296 475184 0 0 0 0 38 4 0 0 100 0 0
0 0 0 2808908 57412 475328 0 0 0 352 136 11 0 0 99 1 0
0 0 0 2808908 57536 475204 0 0 0 43 57 12 0 0 100 0 0
0 0 0 2808908 57536 475204 0 0 0 0 43 4 0 0 100 0 0
0 0 0 2808660 57692 475308 0 0 0 291 109 10 0 0 99 1 0
0 0 0 2808660 57692 475308 0 0 0 0 42 5 0 0 100 0 0
0 0 0 2808288 58132 475388 0 0 0 147 47 8 0 0 100 0 0 |
Is it posible/required to tune the lpfc module?
Poor I/O performance
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