Re: [Xen-devel] PV performance degraded after live migration

[Olaf Hering <olaf@xxxxxxxxx>]

On Wed, Mar 15, Olaf Hering wrote:

> On Wed, Mar 15, Andrew Cooper wrote:
> > As a crazy idea, doest this help?
> > tsc->incarnation = 0

This does indeed help. One system shows now the results below, which
means the performance goes down during migration (to localhost) and goes
back to normal after migration.

What impact has such change to ->incarnation?

Olaf

./sysbench --memory-block-size=8k --memory-total-size=1024T --verbosity=5 
--threads=4 --report-interval=3 --time=1234 memory run
...
[ 3s ]  6322.61 MiB/sec 2421800: 96212(006fb 0088a 00c7e6) 96387(0074f 0083d 
00506f) 926b7(006d4 0088f 00e5c9) 92706(00488 008c4 0458a6) 
[ 6s ]  6319.72 MiB/sec 2418340: 95dab(004a9 00864 01e42f) 961cc(006dc 0087a 
00e824) 921b3(0049b 00898 00cbd5) 924e5(00705 007ea 00f51e) 
[ 9s ]  6319.37 MiB/sec 2418534: 95f1d(00748 009ab 00e5e4) 9607f(006aa 008ef 
00b358) 92237(00497 008a6 00b332) 9253a(0071a 008a8 00e605) 
[ 12s ]  6320.20 MiB/sec 2419101: 95c70(006fb 008cb 08cbb8) 9611b(00722 00855 
00dfc1) 92383(006ce 008d6 00fbc6) 92745(006de 0073c 00fbde) 
[ 15s ]  6320.12 MiB/sec 2419118: 95fc3(00779 00867 00e36b) 96199(00703 0082f 
00e356) 9229e(004ab 0089b 1b5c72) 9242f(00714 0076b 04807b) 
[ 18s ]  6320.38 MiB/sec 2419150: 95ede(00717 0086b 008fbf) 9618b(006de 00855 
00c119) 922e8(0049c 00846 1b1f1a) 92548(00725 007bd 0052f5) 
[ 21s ]  6321.28 MiB/sec 2419539: 95f23(006fc 008bc 00cce3) 9624c(00701 008ae 
00bec0) 921ee(00495 008b7 1b6358) 92686(0071e 008c6 00bf2e) 
[ 24s ]  6319.37 MiB/sec 2418534: 96061(006e2 00904 00c7c8) 96131(006de 00812 
00de5d) 9213e(006d9 00872 1b29a0) 9243e(00712 007cd 00df76) 
[ 27s ]  6320.15 MiB/sec 2418970: 95e0c(006e1 00869 00df81) 9621a(0056f 0088e 
00dfc1) 921f4(004ad 008ae 1b309c) 9261e(006e6 00895 00ee5d) 
[ 30s ]  6322.09 MiB/sec 2419663: 96014(0045f 0084a 00ea91) 96142(006fb 00868 
00eb32) 922f1(006c8 008cc 1b2ce4) 926db(006f8 007b9 00e6f7) 
[ 33s ]  6321.72 MiB/sec 2419470: 95f3a(00506 008ed 00c75c) 96223(006b2 008b5 
00b685) 92412(00497 00909 1b1e69) 92527(00727 0084e 00c72c) 
[ 36s ]  6321.09 MiB/sec 2419262: 95ffa(006f5 00878 00e7fc) 960e5(006de 00868 
00e87d) 921ea(00763 008eb 1b28e2) 926da(00461 007ca 00ed17) 
[ 39s ]  6321.06 MiB/sec 2419519: 95df8(006e8 0095f 00fee4) 96175(006da 00847 
00ea77) 92334(004a5 00915 00fecb) 926f5(006ac 008c8 0050e0) 
[ 42s ]  6319.72 MiB/sec 2418867: 95f05(004c7 00885 00b39d) 9620a(006fd 0086b 
00b70c) 9208b(0048f 0089f 1b24c4) 925fa(006f2 007eb 00b6d6) 
[ 45s ]  6323.08 MiB/sec 2420218: 95fbe(0075a 00864 00eede) 96298(00749 0086b 
004397) 923c9(0049d 008f7 1b1c50) 9267f(0070f 00753 04003e) 
[ 48s ]  6317.78 MiB/sec 2417897: 95dde(0076c 00862 00e858) 9612c(006bd 008a7 
00e859) 92031(0048d 00836 00e916) 92570(006cc 0078b 00e8d7) 
[ 51s ]  6321.18 MiB/sec 2419442: 95f84(0070d 00829 00e37a) 9616a(006bd 0081f 
00ea08) 9224b(006e4 008ac 00e9d6) 9268d(00724 007bc 00e461) 
[ 54s ]  6321.25 MiB/sec 2419366: 95ed3(004b1 0089e 004103) 961c7(0055e 008aa 
00b832) 922c2(0048f 00857 1b1880) 92682(00706 0081f 00deeb) 
[ 57s ]  6322.12 MiB/sec 2419798: 95f73(00766 00825 00e8e5) 9620a(006d5 008a1 
00e841) 92359(00497 00890 1b16b2) 9265a(006dc 0085d 00e8d7) 
[ 60s ]  6320.37 MiB/sec 2419005: 95fc0(006d4 0082b 002927) 96180(006df 0088a 
005721) 92224(0052b 00960 00be51) 92528(00706 008da 00bd32) 
[ 63s ]  6318.10 MiB/sec 2418347: 95e00(006ec 008a0 00c124) 96307(006c7 00801 
0043ac) 91feb(00709 00851 00c226) 92433(006e6 00802 00bbbf) 
[ 66s ]  6320.55 MiB/sec 2419144: 95ed1(006f8 00825 00c152) 9636e(00774 00832 
00bb27) 92107(004a3 008d7 00c21b) 9258d(00714 007e1 006673) 
[ 69s ]  6319.12 MiB/sec 2418691: 95f9a(006ea 00864 00c31c) 962ba(006f8 00891 
00b9d4) 92022(006a5 008ed 00c3a0) 9244b(00680 00789 00bc68) 
[ 72s ]  1522.05 MiB/sec 584258: 23c48(0077e 0172d 0c9a40) 23c92(0068d 04250 
0c9b64) 2391e(004a4 01561 11369a) 2398f(00733 01412 0c6867) 
[ 75s ]  1284.93 MiB/sec 493314: 1e1db(00d70 0105a 00c227) 1e1e6(00db9 0130f 
00db37) 1e18e(00df0 01677 00f62f) 1e1b3(00da8 00fd6 1a1b4f) 
[ 78s ]  1301.39 MiB/sec 499734: 1e79f(00cd3 01034 420524) 1e867(00cbc 01071 
00871e) 1e7ec(0097f 01732 00f5fc) 1e825(00d10 012bf 00cf0f) 
[ 81s ]  1300.86 MiB/sec 499525: 1e7ea(00d6a 0121b 01a401) 1e7e7(00c65 0108d 
00f67b) 1e799(009a2 0186d 00adcc) 1e7dc(00e20 01157 015b74) 
[ 84s ]  1290.08 MiB/sec 495391: 1e3d8(00e13 01133 007bb1) 1e3e8(00d0a 01395 
00d77c) 1e399(00828 0187c 00ee9a) 1e3c7(00d15 0115c 00ae06) 
[ 87s ]  1297.33 MiB/sec 498175: 1e6ae(00d13 010e4 00f34e) 1e686(00be0 00ebe 
00c62f) 1e64b(00cbe 015ee 01118b) 1e681(00d96 0118d 01ea53) 
[ 90s ]  4939.91 MiB/sec 1890347: 750c7(00635 00844 3898ce) 751ee(00657 008b1 
300e9fe) 724c2(0066d 009a8 2f3c63) 72a6a(0065c 00785 2dc2723) 
[ 93s ]  6232.37 MiB/sec 2385348: 936ff(0045f 0087b 2d56e3) 946ff(0067d 00889 
21db77) 90e65(00486 008ce 1a6b04) 8f82a(006cb 008af 298f81) 
[ 96s ]  6320.31 MiB/sec 2419131: 95fda(006e3 0086c 00c323) 96229(006c8 00874 
01132a) 920b0(00771 00890 1b88ae) 925b6(00723 0078f 00c2af) 
[ 99s ]  6320.29 MiB/sec 2419279: 95f57(006e1 0087a 00b85e) 96152(00721 0084b 
003ada) 9214e(00496 0084f 003d47) 92679(006d4 007d2 00c492) 
[ 102s ]  6318.06 MiB/sec 2418173: 95f2f(006f7 0084e 00c617) 96233(0070c 0084f 
00c621) 92056(004a6 0088e 1b2abd) 9235b(006c5 0081c 3406f9)

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