€•ˆ+      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ-/translations/zh_CN/core-api/irq/irq-affinity”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ-/translations/zh_TW/core-api/irq/irq-affinity”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ-/translations/it_IT/core-api/irq/irq-affinity”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ-/translations/ja_JP/core-api/irq/irq-affinity”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ-/translations/ko_KR/core-api/irq/irq-affinity”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ-/translations/sp_SP/core-api/irq/irq-affinity”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒSMP IRQ affinity”h]”hŒSMP IRQ affinity”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒG/var/lib/git/docbuild/linux/Documentation/core-api/irq/irq-affinity.rst”h KubhŒdefinition_list”“”)”}”(hhh]”hŒdefinition_list_item”“”)”}”(hŒhChangeLog:
- Started by Ingo Molnar <mingo@redhat.com>
- Update by Max Krasnyansky <maxk@qualcomm.com>

”h]”(hŒterm”“”)”}”(hŒ
ChangeLog:”h]”hŒ
ChangeLog:”…””}”(hhÄhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÂhŸh¶h Khh¾ubhŒ
definition”“”)”}”(hhh]”hŒbullet_list”“”)”}”(hhh]”(hŒ	list_item”“”)”}”(hŒ)Started by Ingo Molnar <mingo@redhat.com>”h]”hŒ	paragraph”“”)”}”(hhàh]”(hŒStarted by Ingo Molnar <”…””}”(hhähžhhŸNh NubhŒ	reference”“”)”}”(hŒmingo@redhat.com”h]”hŒmingo@redhat.com”…””}”(hhíhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œmailto:mingo@redhat.com”uh1hëhhäubhŒ>”…””}”(hhähžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hâhŸh¶h KhhÞubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜhhÙubhÝ)”}”(hŒ/Update by Max Krasnyansky <maxk@qualcomm.com>

”h]”hã)”}”(hŒ-Update by Max Krasnyansky <maxk@qualcomm.com>”h]”(hŒUpdate by Max Krasnyansky <”…””}”(hj  hžhhŸNh Nubhì)”}”(hŒmaxk@qualcomm.com”h]”hŒmaxk@qualcomm.com”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œmailto:maxk@qualcomm.com”uh1hëhj  ubhŒ>”…””}”(hj  hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hâhŸh¶h Khj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜhhÙubeh}”(h]”h ]”h"]”h$]”h&]”Œbullet”Œ-”uh1h×hŸh¶h KhhÔubah}”(h]”h ]”h"]”h$]”h&]”uh1hÒhh¾ubeh}”(h]”h ]”h"]”h$]”h&]”uh1h¼hŸh¶h Khh¹ubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hh£hžhhŸNh Nubhã)”}”(hXl  /proc/irq/IRQ#/smp_affinity and /proc/irq/IRQ#/smp_affinity_list specify
which target CPUs are permitted for a given IRQ source.  It's a bitmask
(smp_affinity) or cpu list (smp_affinity_list) of allowed CPUs.  It's not
allowed to turn off all CPUs, and if an IRQ controller does not support
IRQ affinity then the value will not change from the default of all cpus.”h]”hXp  /proc/irq/IRQ#/smp_affinity and /proc/irq/IRQ#/smp_affinity_list specify
which target CPUs are permitted for a given IRQ source.  Itâ€™s a bitmask
(smp_affinity) or cpu list (smp_affinity_list) of allowed CPUs.  Itâ€™s not
allowed to turn off all CPUs, and if an IRQ controller does not support
IRQ affinity then the value will not change from the default of all cpus.”…””}”(hjS  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hâhŸh¶h K
hh£hžhubhã)”}”(hX   /proc/irq/default_smp_affinity specifies default affinity mask that applies
to all non-active IRQs. Once IRQ is allocated/activated its affinity bitmask
will be set to the default mask. It can then be changed as described above.
Default mask is 0xffffffff.”h]”hX   /proc/irq/default_smp_affinity specifies default affinity mask that applies
to all non-active IRQs. Once IRQ is allocated/activated its affinity bitmask
will be set to the default mask. It can then be changed as described above.
Default mask is 0xffffffff.”…””}”(hja  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hâhŸh¶h Khh£hžhubhã)”}”(hŒsHere is an example of restricting IRQ44 (eth1) to CPU0-3 then restricting
it to CPU4-7 (this is an 8-CPU SMP box)::”h]”hŒrHere is an example of restricting IRQ44 (eth1) to CPU0-3 then restricting
it to CPU4-7 (this is an 8-CPU SMP box):”…””}”(hjo  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hâhŸh¶h Khh£hžhubhŒliteral_block”“”)”}”(hXf  [root@moon 44]# cd /proc/irq/44
[root@moon 44]# cat smp_affinity
ffffffff

[root@moon 44]# echo 0f > smp_affinity
[root@moon 44]# cat smp_affinity
0000000f
[root@moon 44]# ping -f h
PING hell (195.4.7.3): 56 data bytes
...
--- hell ping statistics ---
6029 packets transmitted, 6027 packets received, 0% packet loss
round-trip min/avg/max = 0.1/0.1/0.4 ms
[root@moon 44]# cat /proc/interrupts | grep 'CPU\|44:'
        CPU0       CPU1       CPU2       CPU3      CPU4       CPU5        CPU6       CPU7
44:       1068       1785       1785       1783         0          0           0         0    IO-APIC-level  eth1”h]”hXf  [root@moon 44]# cd /proc/irq/44
[root@moon 44]# cat smp_affinity
ffffffff

[root@moon 44]# echo 0f > smp_affinity
[root@moon 44]# cat smp_affinity
0000000f
[root@moon 44]# ping -f h
PING hell (195.4.7.3): 56 data bytes
...
--- hell ping statistics ---
6029 packets transmitted, 6027 packets received, 0% packet loss
round-trip min/avg/max = 0.1/0.1/0.4 ms
[root@moon 44]# cat /proc/interrupts | grep 'CPU\|44:'
        CPU0       CPU1       CPU2       CPU3      CPU4       CPU5        CPU6       CPU7
44:       1068       1785       1785       1783         0          0           0         0    IO-APIC-level  eth1”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1j}  hŸh¶h Khh£hžhubhã)”}”(hŒ‡As can be seen from the line above IRQ44 was delivered only to the first four
processors (0-3).
Now lets restrict that IRQ to CPU(4-7).”h]”hŒ‡As can be seen from the line above IRQ44 was delivered only to the first four
processors (0-3).
Now lets restrict that IRQ to CPU(4-7).”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hâhŸh¶h K)hh£hžhubj~  )”}”(hX  [root@moon 44]# echo f0 > smp_affinity
[root@moon 44]# cat smp_affinity
000000f0
[root@moon 44]# ping -f h
PING hell (195.4.7.3): 56 data bytes
..
--- hell ping statistics ---
2779 packets transmitted, 2777 packets received, 0% packet loss
round-trip min/avg/max = 0.1/0.5/585.4 ms
[root@moon 44]# cat /proc/interrupts |  'CPU\|44:'
        CPU0       CPU1       CPU2       CPU3      CPU4       CPU5        CPU6       CPU7
44:       1068       1785       1785       1783      1784       1069        1070       1069   IO-APIC-level  eth1”h]”hX  [root@moon 44]# echo f0 > smp_affinity
[root@moon 44]# cat smp_affinity
000000f0
[root@moon 44]# ping -f h
PING hell (195.4.7.3): 56 data bytes
..
--- hell ping statistics ---
2779 packets transmitted, 2777 packets received, 0% packet loss
round-trip min/avg/max = 0.1/0.5/585.4 ms
[root@moon 44]# cat /proc/interrupts |  'CPU\|44:'
        CPU0       CPU1       CPU2       CPU3      CPU4       CPU5        CPU6       CPU7
44:       1068       1785       1785       1783      1784       1069        1070       1069   IO-APIC-level  eth1”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”j  jŽ  uh1j}  hŸh¶h K/hh£hžhubhã)”}”(hŒrThis time around IRQ44 was delivered only to the last four processors.
i.e counters for the CPU0-3 did not change.”h]”hŒrThis time around IRQ44 was delivered only to the last four processors.
i.e counters for the CPU0-3 did not change.”…””}”(hj«  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hâhŸh¶h K<hh£hžhubhã)”}”(hŒHHere is an example of limiting that same irq (44) to cpus 1024 to 1031::”h]”hŒGHere is an example of limiting that same irq (44) to cpus 1024 to 1031:”…””}”(hj¹  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hâhŸh¶h K?hh£hžhubj~  )”}”(hŒb[root@moon 44]# echo 1024-1031 > smp_affinity_list
[root@moon 44]# cat smp_affinity_list
1024-1031”h]”hŒb[root@moon 44]# echo 1024-1031 > smp_affinity_list
[root@moon 44]# cat smp_affinity_list
1024-1031”…””}”hjÇ  sbah}”(h]”h ]”h"]”h$]”h&]”j  jŽ  uh1j}  hŸh¶h KAhh£hžhubhã)”}”(hŒbNote that to do this with a bitmask would require 32 bitmasks of zero
to follow the pertinent one.”h]”hŒbNote that to do this with a bitmask would require 32 bitmasks of zero
to follow the pertinent one.”…””}”(hjÕ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hâhŸh¶h KEhh£hžhubeh}”(h]”Œsmp-irq-affinity”ah ]”h"]”Œsmp irq affinity”ah$]”h&]”uh1h¡hhhžhhŸh¶h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h¶uh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¦NŒ	generator”NŒ	datestamp”NŒsource_link”NŒ
source_url”NŒtoc_backlinks”Œentry”Œfootnote_backlinks”KŒsectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒstrip_classes”NŒreport_level”KŒ
halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ	traceback”ˆŒinput_encoding”Œ	utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”j  Œerror_encoding”Œutf-8”Œerror_encoding_error_handler”Œbackslashreplace”Œlanguage_code”Œen”Œrecord_dependencies”NŒconfig”NŒ	id_prefix”hŒauto_id_prefix”Œid”Œdump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”h¶Œ_destination”NŒ_config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒfile_insertion_enabled”ˆŒraw_enabled”KŒline_length_limit”M'Œpep_references”NŒpep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒrfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ	tab_width”KŒtrim_footnote_reference_space”‰Œsyntax_highlight”Œlong”Œsmart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œdocinfo_xform”KŒsectsubtitle_xform”‰Œimage_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œrefids”}”Œnameids”}”jè  jå  sŒ	nametypes”}”jè  ‰sh}”jå  h£sŒfootnote_refs”}”Œcitation_refs”}”Œautofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ	footnotes”]”Œ	citations”]”Œautofootnote_start”KŒsymbol_footnote_start”K Œ
id_counter”Œcollections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œtransformer”NŒinclude_log”]”Œ
decoration”Nhžhub.