Re: [Xen-users] Release 0.9.9 of GPL PV Drivers for Windows

[jim burns <jim_burn@xxxxxxxxxxxxx>]

On Saturday June 14 2008 09:18:14 am James Harper wrote:
> I've just uploaded 0.9.9 to http://www.meadowcourt.org/downloads
>
> As a reminder, the wiki page is
> http://wiki.xensource.com/xenwiki/XenWindowsGplPv

Equipment: core 2 duo 5600, 1.83ghz each, 2M, sata drive configured for
UDMA/100; System: fc8 64bit, xen 3.1.2, xen.gz 3.1.3, dom0 2.6.21
Tested hvm: XP Pro SP3, 2002 32bit  w/512M, file backed vbd on local disk, 
tested w/ iometer 2006-07-27 (1Gb \iobw.tst, 5min run) & iperf 1.7.0 (1 min 
run)

I previously reported that 0.9.1 suffered a 20-25% Iometer performance 
decrease over 0.8.9 on the 4k pattern (not bad for an initial rewrite from 
Wdf -> Wdm), but posted no actual numbers. Thus these are the old 0.8.9 
numbers:

pattern 4k, 50% read, 0% random

dynamo on?  |   io/s   |  MB/s  | Avg. i/o time(ms} | max i/o time(ms) | %CPU
domu w/gplpv|   417.5  |   1.63 |        7.39       |       0          | 27.29
domu w/qemu |   155.4  |   0.60 |       -4.60       |       0          | 29.23
dom0 w/2Gb  |   891.6  |   3.48 |        1.12       |      574.4       |  0
dom0 w/2Gb  |  1033.1  |   4.04 |        0.97       |      242.4       |  0
(2nd dom0 numbers from when booted w/o /gplpv)

pattern 32k, 50% read, 0% random

domu w/gplpv|   228.6  |   7.15 |       -4.65       |        0         | 21.64
domu w/qemu |   120.4  |   3.76 |       83.63       |        0         | 28.50
dom0 w/2Gb  |    42.0  |   1.31 |       23.80       |     2084.7       |  0
dom0 w/2Gb  |    88.3  |   2.76 |       11.32       |     1267.3       |  0

and now the 0.9.9 numbers:

pattern 4k, 50% read, 0% random

dynamo on?  |   io/s   |  MB/s  | Avg. i/o time(ms} | max i/o time(ms) | %CPU
domu w/gplpv|   336.9  |   1.32 |      -65.35       |       0          | 12.78
domu w/qemu |   191.8  |   0.75 |        7.88       |       0          | 17.40
dom0 w/2Gb  |  1051.4  |   4.11 |        0.95       |      446.0       |  0
dom0 w/2Gb  |  1111.0  |   4.34 |        0.90       |      434.2       |  0
(2nd dom0 numbers from when booted w/o /gplpv)

pattern 32k, 50% read, 0% random

domu w/gplpv|   113.4  |   3.54 |     -392.87       |        0         |  7.49
domu w/qemu |   106.3  |   3.32 |        4.13       |        0         |  7.41
dom0 w/2Gb  |    47.3  |   1.48 |       21.10       |     2062.9       |  0
dom0 w/2Gb  |    77.3  |   2.41 |       12.94       |     1256.6       |  0

There is still a 20% decrease in performance on the 4k pattern. %CPU is way 
down, but that may be because I'm using rdesktop instead of vnc.

Now running one domain thread at a time, with any other domains running 
the 'idle' task. First the old numbers:

gplpv 0.8.9:
 4k pattern |  1170.0  |   4.57 |        7.16       |       0          | 41.34
32k pattern |   287.0  |   8.97 |      -30.85       |       0          | 23.39

dom0:
 4k pattern |  1376.7  |   5.38 |        0.73       |      365.7       |  0
32k pattern |  1484.3  |   5.80 |        0.67       |      314.4       |  0

and now the new:

gplpv 0.9.9:
 4k pattern |   843.3  |   3.29 |      -26.36       |       0          | 26.37
32k pattern |   192.9  |   6.03 |        5.17       |       0          |  9.12

dom0:
 4k pattern |  1702.7  |   6.65 |        0.59       |      367.0       |  0
32k pattern |   162.7  |   5.08 |        6.14       |      248.7       |  0

There's again a 30% decrease in 4k (& 32k) patterns, and less %CPU.

For network, a tcp test w/0.9.1 (essentially the same as 
0.8.9), 'iperf-1.7.0 -c dom0-name -t 60 -r', gave:

domu->dom0: 31 Mb/s
dom0->domu: 36 Mb/s

For a udp test, requesting a 10Mb/s bandwidth, 'iperf-1.7.0 -c dom0-name -t 
60 -r -b 10000000' gave:

domu->dom0: 2.6 Mb/s
dom0->domu: 9.9 Mb/s

and for 0.9.9:
For a tcp test, 'iperf-1.7.0 -c dom0-name -t 60 -r':

domu->dom0: 34 Mb/s (better)
dom0->domu: 89 Mb/s (wow!)

For a udp test, requesting a 10Mb/s bandwidth, 'iperf-1.7.0 -c dom0-name -t 
60 -r -b 10000000' gave:

domu->dom0: 5.2 Mb/s (better)
dom0->domu: 4.5 Mb/s w/54% loss (worse)

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