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Date: Sat, 31 Dec 2011 07:51:15 +0530
From: Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
To: Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>
Cc: peterz@...radead.org, linux-kernel@...r.kernel.org,
vatsa@...ux.vnet.ibm.com, bharata@...ux.vnet.ibm.com
Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS
On Fri, 30 Dec 2011 15:40:06 +0530, Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com> wrote:
> On Fri, 30 Dec 2011 10:51:47 +0100, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Avi Kivity <avi@...hat.com> wrote:
> >
> > > [...]
> > >
> > > The first part appears to be unrelated to ebizzy itself - it's
> > > the kunmap_atomic() flushing ptes. It could be eliminated by
> > > switching to a non-highmem kernel, or by allocating more PTEs
> > > for kmap_atomic() and batching the flush.
> >
> > Nikunj, please only run pure 64-bit/64-bit combinations - by the
> > time any fix goes upstream and trickles down to distros 32-bit
> > guests will be even less relevant than they are today.
> >
> Sure Ingo, got a 64bit guest working yesterday and I am in process of
> getting the benchmark numbers for the same.
>
Here is the results collected from the 64bit VM runs.
Avi, x2apic is enabled in the both guest/host.
One more change in the test setup is I am creating and destroying the VM
for each benchmark run. Earlier, I used to create 2/4/8 VMs and run 5
benchmarks one by one(VM was not fresh for some benchmark)
PLE - Test Setup:
=================
- x3850x5 machine - PLE enabled
- 8 CPUs (HT disabled)
- 264GB memory
- VM details:
- Guest kernel: 2.6.32 based enterprise kernel
- 1024MB memory
- 8 VCPUs
- During gang runs, vcpus are pinned
Results:
* GangVsBase - Gang vs Baseline kernel
* GangVsPin - Gang vs Baseline kernel + vcpus pinned
* V1 - Using set_next_buddy
* V2 - Using set_gang_buddy
* Results are % improvement/degradation
+-------------+-----------------------+----------------------+
| | V1 | V2 |
+ Benchmarks +-----------+-----------+-----------+----------+
| | GngVsBase | GngVsPin | GngVsBase | GngVsPin |
+-------------+-----------+-----------+-----------+----------+
| kbench-2vm | -4 | -5 | -1 | -1 |
| kbench-4vm | -13 | -3 | 3 | 12 |
| kbench-8vm | -11 | 0 | -5 | 5 |
+-------------+-----------+-----------+-----------+----------+
| ebizzy-2vm | -1 | -2 | 17 | 16 |
| ebizzy-4vm | 4 | 6 | 58 | 61 |
| ebizzy-8vm | 3 | 25 | 68 | 103 |
+-------------+-----------+-----------+-----------+----------+
| specjbb-2vm | -7 | 0 | -6 | 1 |
| specjbb-4vm | 19 | 30 | -5 | 3 |
| specjbb-8vm | -6 | 1 | 5 | 15 |
+-------------+-----------+-----------+-----------+----------+
| hbench-2vm | -1 | -6 | 18 | 14 |
| hbench-4vm | -64 | -9 | -2 | 31 |
| hbench-8vm | -28 | 10 | 32 | 53 |
+-------------+-----------+-----------+-----------+----------+
| dbench-2vm | -3 | -5 | -2 | -3 |
| dbench-4vm | 9 | 0 | 3 | -5 |
| dbench-8vm | -3 | -23 | -8 | -26 |
+-------------+-----------+-----------+-----------+----------+
The best and worst case in V2(GangVsBase).
ebizzy 8vm (improved 68%)
+------------+--------------------+--------------------+----------+
| Ebizzy |
+------------+--------------------+--------------------+----------+
| Parameter | GangBase | Gang V2 | % imprv |
+------------+--------------------+--------------------+----------+
| ebizzy| 2531.75 | 4268.12 | 68 |
| EbzyUser| 32.60 | 60.70 | 86 |
| EbzySys| 165.48 | 171.05 | -3 |
| EbzyReal| 60.00 | 60.00 | 0 |
| BwUsage| 568645533105.00 | 767186043286.00 | 34 |
| HostIdle| 89.00 | 89.00 | 0 |
| UsrTime| 2.00 | 4.00 | 100 |
| SysTime| 12.00 | 13.00 | -8 |
| IOWait| 3.00 | 4.00 | -33 |
| IdleTime| 81.00 | 77.00 | -4 |
| TPS| 12.00 | 12.00 | 0 |
+-----------------------------------------------------------------+
GangV2:
27.45% ebizzy libc-2.12.so [.] __memcpy_ssse3_back
12.12% ebizzy [kernel.kallsyms] [k] clear_page
9.22% ebizzy [kernel.kallsyms] [k] __do_page_fault
6.91% ebizzy [kernel.kallsyms] [k] flush_tlb_others_ipi
4.06% ebizzy [kernel.kallsyms] [k] get_page_from_freelist
4.04% ebizzy [kernel.kallsyms] [k] ____pagevec_lru_add
GangBase:
45.08% ebizzy [kernel.kallsyms] [k] flush_tlb_others_ipi
15.38% ebizzy libc-2.12.so [.] __memcpy_ssse3_back
7.00% ebizzy [kernel.kallsyms] [k] clear_page
4.88% ebizzy [kernel.kallsyms] [k] __do_page_fault
dbench 8vm (degraded -8%)
+------------+--------------------+--------------------+----------+
| Dbench |
+------------+--------------------+--------------------+----------+
| Parameter | GangBase | Gang V2 | % imprv |
+------------+--------------------+--------------------+----------+
| dbench| 2.27 | 2.09 | -8 |
| BwUsage| 138973336762.00 | 187382519973.00 | 34 |
| HostIdle| 95.00 | 93.00 | 2 |
| IOWait| 20.00 | 19.00 | 5 |
| IdleTime| 78.00 | 78.00 | 0 |
| TPS| 13.00 | 14.00 | 7 |
| CacheMisses| 81611667.00 | 72959014.00 | 10 |
| CacheRefs| 4990591975.00 | 4624251595.00 | -7 |
|BranchMisses| 812569051.00 | 1162137278.00 | -43 |
| Branches| 20196543212.00 | 30318934960.00 | 50 |
|Instructions| 99519592926.00 | 152169154440.00 | -52 |
| Cycles| 265699995531.00 | 330718402913.00 | -24 |
| PageFlt| 36083.00 | 35897.00 | 0 |
| ContextSW| 3170710.00 | 8304284.00 | -161 |
| CPUMigrat| 63387.00 | 155521.00 | -145 |
+-----------------------------------------------------------------+
dbench needs some more love, i will get the perf top caller for
that.
non-PLE - Test Setup:
=====================
- x3650 M2 machine
- 8 CPUs (HT disabled)
- 64GB memory
- VM details:
- Guest kernel: 2.6.32 based enterprise kernel
- 1024MB memory
- 8 VCPUs
- During gang runs, vcpus are pinned
Results:
* GangVsBase - Gang vs Baseline kernel
* GangVsPin - Gang vs Baseline kernel + vcpus pinned
* V1 - using set_next_buddy
* V2 - using set_gang_buddy
* Results are % improvement/degradation
+-------------+-----------------------+----------------------+
| | V1 | V2 |
+ Benchmarks +-----------+-----------+-----------+----------+
| | GngVsBase | GngVsPin | GngVsBase | GngVsPin |
+-------------+-----------+-----------+-----------+----------+
| kbench-2vm | 0 | 2 | -7 | -5 |
| kbench-4vm | 2 | -3 | 7 | 2 |
| kbench-8vm | 0 | -1 | -1 | -3 |
+-------------+-----------+-----------+-----------+----------+
| ebizzy-2vm | 221 | 109 | 241 | 122 |
| ebizzy-4vm | 215 | 173 | 366 | 304 |
| ebizzy-8vm | 225 | 88 | 331 | 149 |
+-------------+-----------+-----------+-----------+----------+
| specjbb-2vm | -5 | -3 | -7 | -5 |
| specjbb-4vm | 29 | -4 | 3 | -23 |
| specjbb-8vm | 6 | -6 | 16 | 2 |
+-------------+-----------+-----------+-----------+----------+
| hbench-2vm | -16 | 2 | 15 | 29 |
| hbench-4vm | -25 | 2 | 32 | 47 |
| hbench-8vm | -46 | -19 | 35 | 47 |
+-------------+-----------+-----------+-----------+----------+
| dbench-2vm | 0 | 1 | -5 | -3 |
| dbench-4vm | -9 | -4 | -2 | 2 |
| dbench-8vm | -52 | 17 | -30 | 69 |
+-------------+-----------+-----------+-----------+----------+
The best and worst case in V2(GangVsBase).
ebizzy 8vm (improved 331%)
+------------+--------------------+--------------------+----------+
| Ebizzy |
+------------+--------------------+--------------------+----------+
| Parameter | GangBase | Gang V2 | % imprv |
+------------+--------------------+--------------------+----------+
| ebizzy| 719.50 | 3101.38 | 331 |
| EbzyUser| 3.79 | 58.04 | 1432 |
| EbzySys| 66.61 | 140.04 | -110 |
| EbzyReal| 60.00 | 60.00 | 0 |
| BwUsage| 526550032993.00 | 652012141757.00 | 23 |
| HostIdle| 59.00 | 62.00 | -5 |
| SysTime| 5.00 | 11.00 | -120 |
| IOWait| 4.00 | 4.00 | 0 |
| IdleTime| 89.00 | 79.00 | -11 |
| TPS| 11.00 | 12.00 | 9 |
+-----------------------------------------------------------------+
GangV2:
27.96% ebizzy libc-2.12.so [.] __memcpy_ssse3_back
12.13% ebizzy [kernel.kallsyms] [k] clear_page
11.66% ebizzy [kernel.kallsyms] [k] __bitmap_empty
11.54% ebizzy [kernel.kallsyms] [k] flush_tlb_others_ipi
5.93% ebizzy [kernel.kallsyms] [k] __do_page_fault
GangBase;
36.34% ebizzy [kernel.kallsyms] [k] __bitmap_empty
35.95% ebizzy [kernel.kallsyms] [k] flush_tlb_others_ipi
8.52% ebizzy libc-2.12.so [.] __memcpy_ssse3_back
dbench 8vm (degraded -30%)
+------------+--------------------+--------------------+----------+
| Dbench |
+------------+--------------------+--------------------+----------+
| Parameter | GangBase | Gang V2 | % imprv |
+------------+--------------------+--------------------+----------+
| dbench| 2.01 | 1.38 | -30 |
| BwUsage| 100408068913.00 | 176095548113.00 | 75 |
| HostIdle| 82.00 | 74.00 | 9 |
| IOWait| 25.00 | 23.00 | 8 |
| IdleTime| 74.00 | 71.00 | -4 |
| TPS| 13.00 | 13.00 | 0 |
| CacheMisses| 137351386.00 | 267116184.00 | -94 |
| CacheRefs| 4347880250.00 | 5830408064.00 | 34 |
|BranchMisses| 602120546.00 | 1110592466.00 | -84 |
| Branches| 22275747114.00 | 39163309805.00 | 75 |
|Instructions| 107942079625.00 | 195313721170.00 | -80 |
| Cycles| 271014283494.00 | 481886203993.00 | -77 |
| PageFlt| 44373.00 | 47679.00 | -7 |
| ContextSW| 3318033.00 | 11598234.00 | -249 |
| CPUMigrat| 82475.00 | 423066.00 | -412 |
+-----------------------------------------------------------------+
Regards
Nikunj
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