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qemu / qemu / cdd7abfdba9287a289c404dfdcb02316f9ffee7d
commitcdd7abfdba9287a289c404dfdcb02316f9ffee7d[log] [tgz]
authorStefan Hajnoczi <stefanha@redhat.com>Thu Jan 26 17:01:19 2017 +0000
committerStefan Hajnoczi <stefanha@redhat.com>Fri Feb 03 14:23:38 2017 +0000
tree1aa7d07d263b705c790a3c9a3d1a1fc5c9b273f9
parent4100a344eb3d50d88f9da85cae334afc47aee134 [diff]
iothread: enable AioContext polling by default

IOThread AioContexts are likely to consist only of event sources like
virtqueue ioeventfds and LinuxAIO completion eventfds that are pollable
from userspace (without system calls).

We recently merged the AioContext polling feature but didn't enable it
by default yet.  I have gone back over the performance data on the
mailing list and picked a default polling value that gave good results.

Let's enable AioContext polling by default so users don't have another
switch they need to set manually.  If performance regressions are found
we can still disable this for the QEMU 2.9 release.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Karl Rister <krister@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170126170119.27876-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
1 file changed
tree: 1aa7d07d263b705c790a3c9a3d1a1fc5c9b273f9
  1. audio/
  2. backends/
  3. block/
  4. bsd-user/
  5. chardev/
  6. contrib/
  7. crypto/
  8. default-configs/
  9. disas/
  10. docs/
  11. fpu/
  12. fsdev/
  13. gdb-xml/
  14. hw/
  15. include/
  16. io/
  17. libdecnumber/
  18. linux-headers/
  19. linux-user/
  20. migration/
  21. nbd/
  22. net/
  23. pc-bios/
  24. po/
  25. qapi/
  26. qga/
  27. qobject/
  28. qom/
  29. replay/
  30. roms/
  31. scripts/
  32. slirp/
  33. stubs/
  34. target/
  35. tcg/
  36. tests/
  37. trace/
  38. ui/
  39. util/
  40. dtc
  41. pixman
  42. .dir-locals.el
  43. .exrc
  44. .gitignore
  45. .gitmodules
  46. .mailmap
  47. .travis.yml
  48. accel.c
  49. aio-posix.c
  50. aio-win32.c
  51. arch_init.c
  52. async.c
  53. atomic_template.h
  54. balloon.c
  55. block.c
  56. blockdev-nbd.c
  57. blockdev.c
  58. blockjob.c
  59. bootdevice.c
  60. bt-host.c
  61. bt-vhci.c
  62. Changelog
  63. CODING_STYLE
  64. configure
  65. COPYING
  66. COPYING.LIB
  67. cpu-exec-common.c
  68. cpu-exec.c
  69. cpus-common.c
  70. cpus.c
  71. cputlb.c
  72. device-hotplug.c
  73. device_tree.c
  74. disas.c
  75. dma-helpers.c
  76. dump.c
  77. exec.c
  78. gdbstub.c
  79. HACKING
  80. hax-stub.c
  81. hmp-commands-info.hx
  82. hmp-commands.hx
  83. hmp.c
  84. hmp.h
  85. iohandler.c
  86. ioport.c
  87. iothread.c
  88. kvm-all.c
  89. kvm-stub.c
  90. LICENSE
  91. main-loop.c
  92. MAINTAINERS
  93. Makefile
  94. Makefile.objs
  95. Makefile.target
  96. memory.c
  97. memory_ldst.inc.c
  98. memory_mapping.c
  99. module-common.c
  100. monitor.c
  101. numa.c
  102. os-posix.c
  103. os-win32.c
  104. page_cache.c
  105. qapi-schema.json
  106. qdev-monitor.c
  107. qdict-test-data.txt
  108. qemu-bridge-helper.c
  109. qemu-doc.texi
  110. qemu-ga.texi
  111. qemu-img-cmds.hx
  112. qemu-img.c
  113. qemu-img.texi
  114. qemu-io-cmds.c
  115. qemu-io.c
  116. qemu-nbd.c
  117. qemu-nbd.texi
  118. qemu-option-trace.texi
  119. qemu-options-wrapper.h
  120. qemu-options.h
  121. qemu-options.hx
  122. qemu-seccomp.c
  123. qemu-tech.texi
  124. qemu-timer.c
  125. qemu.nsi
  126. qemu.sasl
  127. qmp.c
  128. qtest.c
  129. README
  130. replication.c
  131. replication.h
  132. rules.mak
  133. softmmu_template.h
  134. spice-qemu-char.c
  135. tcg-runtime.c
  136. tci.c
  137. thread-pool.c
  138. thunk.c
  139. tpm.c
  140. trace-events
  141. translate-all.c
  142. translate-all.h
  143. translate-common.c
  144. user-exec-stub.c
  145. user-exec.c
  146. VERSION
  147. version.rc
  148. vl.c
  149. xen-common-stub.c
  150. xen-common.c
  151. xen-hvm-stub.c
  152. xen-hvm.c
  153. xen-mapcache.c