Messages in this thread | | | From | Nikunj A Dadhania <> | Subject | Re: [RFC PATCH 0/4] Gang scheduling in CFS | Date | Sat, 31 Dec 2011 07:51:15 +0530 |
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On Fri, 30 Dec 2011 15:40:06 +0530, Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> wrote: > On Fri, 30 Dec 2011 10:51:47 +0100, Ingo Molnar <mingo@elte.hu> wrote: > > > > * Avi Kivity <avi@redhat.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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