Or Gerlitz, on 02/04/2010 05:21 PM wrote:
Bart Van Assche wrote:
Sounds really interesting. Do you have numbers available about how
much these patches improve throughput or decrease latency ?
Yes, generally speaking after the patches the initiator peaks to about 300-400K
IOPS
with latency under such load being 20-30us and before the patches the initiator
was
doing upto 200K IOPS with the latency under such load being 50-100us, see some
data
I got today on mytest bed. Being focused on the initiator, I was using a "NULL
device"
at the target side.
Also, what kind of test did you do?
AFTER
r b swpd free buff cache si so bi bo in cs us sy id wa st
11 11 0 6212936 260552 367356 0 0 308671 0 285596 492842 4 64
0 31 0
7 13 0 6212936 260552 367356 0 0 309628 24 285138 496537 5 61
0 33 0
10 12 0 6212936 260552 367356 0 0 308222 0 277868 489261 4 65
0 30 0
8 13 0 6212936 260552 367356 0 0 310724 0 282151 493868 4 67
0 29 0
12 11 0 6212936 260552 367356 0 0 308209 0 278753 489797 5 66
0 29 0
Linux 2.6.33-rc4 (cto-1) 02/04/2010
avg-cpu: %user %nice %system %iowait %steal %idle
4.62 0.00 66.29 28.71 0.00 0.37
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz
await svctm %util
sdd 0.00 0.00 88905.94 0.00 177811.88 0.00 2.00
2.82 0.03 0.01 98.61
sdf 0.00 0.00 64021.78 0.00 128045.54 0.00 2.00
2.55 0.04 0.02 96.24
sdh 0.00 0.00 88922.77 0.00 177845.54 0.00 2.00
2.85 0.03 0.01 99.01
sdj 0.00 0.00 64662.38 0.00 129324.75 0.00 2.00
2.69 0.04 0.02 97.82
BEFORE
r b swpd free buff cache si so bi bo in cs us sy id wa st
6 14 0 6211804 260684 368584 0 0 195551 0 195997 557463 3 56
4 37 0
7 13 0 6211804 260684 368584 0 0 191347 0 192311 525823 3 58
3 36 0
6 15 0 6211804 260692 368584 0 0 187135 16 190875 503739 3 58
3 35 0
8 14 0 6211804 260692 368584 0 0 193745 0 193921 556821 3 55
4 38 0
8 16 0 6211804 260692 368584 0 0 191233 0 191549 536499 3 58
4 35 0
Linux 2.6.33-rc4 (cto-1) 02/04/2010
avg-cpu: %user %nice %system %iowait %steal %idle
2.24 0.00 58.16 35.87 0.00 3.74
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz
await svctm %util
sdd 0.00 0.00 33964.00 0.00 67928.00 0.00 2.00
3.36 0.10 0.03 100.00
sdf 0.00 0.00 33456.00 0.00 66912.00 0.00 2.00
3.34 0.10 0.03 99.60
sdh 0.00 0.00 63176.00 0.00 126352.00 0.00 2.00
3.40 0.05 0.02 100.00
sdj 0.00 0.00 62973.00 0.00 125946.00 0.00 2.00
3.38 0.05 0.02 100.40
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