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qemu / qemu / f65ed4c1529f29a7d62d6733eaa50bed24a4b2ed
commitf65ed4c1529f29a7d62d6733eaa50bed24a4b2ed[log] [tgz]
authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>Tue Dec 09 20:09:57 2008 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>Tue Dec 09 20:09:57 2008 +0000
tree1d0351afc0542f8f709f9ed7f6a445474b137a9e
parentd85dc283fa87353be10b11b463196d10eb49ca41 [diff]
KVM: Coalesced MMIO support

MMIO exits are more expensive in KVM or Xen than in QEMU because they 
involve, at least, privilege transitions.  However, MMIO write 
operations can be effectively batched if those writes do not have side 
effects.

Good examples of this include VGA pixel operations when in a planar 
mode.  As it turns out, we can get a nice boost in other areas too.  
Laurent mentioned a 9.7% performance boost in iperf with the coalesced 
MMIO changes for the e1000 when he originally posted this work for KVM.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5961 c046a42c-6fe2-441c-8c8c-71466251a162
8 files changed
tree: 1d0351afc0542f8f709f9ed7f6a445474b137a9e
  1. audio/
  2. bsd-user/
  3. darwin-user/
  4. fpu/
  5. gdb-xml/
  6. hw/
  7. keymaps/
  8. linux-user/
  9. pc-bios/
  10. slirp/
  11. target-alpha/
  12. target-arm/
  13. target-cris/
  14. target-i386/
  15. target-m68k/
  16. target-mips/
  17. target-ppc/
  18. target-sh4/
  19. target-sparc/
  20. tcg/
  21. tests/
  22. .gitignore
  23. a.out.h
  24. aes.c
  25. aes.h
  26. aio.c
  27. alpha-dis.c
  28. alpha.ld
  29. arm-dis.c
  30. arm-semi.c
  31. arm.ld
  32. balloon.h
  33. block-bochs.c
  34. block-cloop.c
  35. block-cow.c
  36. block-dmg.c
  37. block-nbd.c
  38. block-parallels.c
  39. block-qcow.c
  40. block-qcow2.c
  41. block-raw-posix.c
  42. block-raw-win32.c
  43. block-vmdk.c
  44. block-vpc.c
  45. block-vvfat.c
  46. block.c
  47. block.h
  48. block_int.h
  49. bswap.h
  50. bt-host.c
  51. bt-vhci.c
  52. buffered_file.c
  53. buffered_file.h
  54. Changelog
  55. check_ops.sh
  56. cocoa.m
  57. configure
  58. console.c
  59. console.h
  60. COPYING
  61. COPYING.LIB
  62. cpu-all.h
  63. cpu-defs.h
  64. cpu-exec.c
  65. cris-dis.c
  66. curses.c
  67. curses_keys.h
  68. cutils.c
  69. d3des.c
  70. d3des.h
  71. def-helper.h
  72. dis-asm.h
  73. disas.c
  74. disas.h
  75. dyngen-exec.h
  76. elf.h
  77. elf_ops.h
  78. exec-all.h
  79. exec.c
  80. feature_to_c.sh
  81. gdbstub.c
  82. gdbstub.h
  83. gen-icount.h
  84. host-utils.c
  85. host-utils.h
  86. hostregs_helper.h
  87. hpet.h
  88. hppa-dis.c
  89. hppa.ld
  90. i386-dis.c
  91. i386.ld
  92. ia64.ld
  93. keymaps.c
  94. kqemu.c
  95. kqemu.h
  96. kvm-all.c
  97. kvm.h
  98. LICENSE
  99. loader.c
  100. m68k-dis.c
  101. m68k-semi.c
  102. m68k.ld
  103. MAINTAINERS
  104. Makefile
  105. Makefile.target
  106. migration-exec.c
  107. migration-tcp.c
  108. migration.c
  109. migration.h
  110. mips-dis.c
  111. mips.ld
  112. mipsel.ld
  113. monitor.c
  114. nbd.c
  115. nbd.h
  116. net-checksum.c
  117. net.c
  118. net.h
  119. osdep.c
  120. osdep.h
  121. ppc-dis.c
  122. ppc.ld
  123. ppc64.ld
  124. qemu-aio.h
  125. qemu-binfmt-conf.sh
  126. qemu-char.c
  127. qemu-char.h
  128. qemu-common.h
  129. qemu-doc.texi
  130. qemu-img.c
  131. qemu-img.texi
  132. qemu-lock.h
  133. qemu-log.h
  134. qemu-malloc.c
  135. qemu-nbd.c
  136. qemu-nbd.texi
  137. qemu-sockets.c
  138. qemu-tech.texi
  139. qemu-timer.h
  140. qemu-tool.c
  141. qemu_socket.h
  142. readline.c
  143. README
  144. s390-dis.c
  145. s390.ld
  146. savevm.c
  147. sdl.c
  148. sdl_keysym.h
  149. sh4-dis.c
  150. softmmu-semi.h
  151. softmmu_defs.h
  152. softmmu_exec.h
  153. softmmu_header.h
  154. softmmu_template.h
  155. sparc-dis.c
  156. sparc.ld
  157. sparc64.ld
  158. sys-queue.h
  159. sysemu.h
  160. tap-win32.c
  161. texi2pod.pl
  162. thunk.c
  163. thunk.h
  164. TODO
  165. translate-all.c
  166. uboot_image.h
  167. usb-bsd.c
  168. usb-linux.c
  169. usb-stub.c
  170. VERSION
  171. vgafont.h
  172. vl.c
  173. vnc.c
  174. vnc_keysym.h
  175. vnchextile.h
  176. x86_64.ld
  177. x_keymap.c