Hi, I've performed some preliminary barrier tests with 2.6.27-rc1-ext4-1: http://www.bullopensource.org/ext4/20080818-barrier/ (also attached.) They complement Celine's results. -- solofo
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | |Sequential Output |Sequential Input | | |Sequential Create |Random Create | |--------------------------+------------------------------+--------------------|Random |-------------+------------------------------+------------------------------| | |Size:Chunk|Per Char |Block |Rewrite |Per Char |Block |Seeks |Num Files |Create |Read |Delete |Create |Read |Delete | | |Size | | | | | | | | | | | | | | |--------------------------+---------+----------+---------+---------+----------+----------+-------------+---------+----------+---------+---------+----------+---------| | |K/sec|% |K/sec |% |K/sec|% |K/sec|% |K/sec |% |/ sec |% | |/ sec|% |/ sec |% |/ sec|% |/ sec|% |/ sec |% |/ sec|% | | | |CPU| |CPU| |CPU| |CPU| |CPU| |CPU| | |CPU| |CPU| |CPU| |CPU| |CPU| |CPU| |--------------------------+-----+---+------+---+-----+---+-----+---+------+---+------+---+-------------+-----+---+------+---+-----+---+-----+---+------+---+-----+---| |"ext4devbarrier|8G |71781|99 |139767|16 |67193|12 |72576|91 |181064|20 |1085.5|1 |100:4096:4096|37786|86 |143338|100|64885|99 |40096|91 |129193|99 |50136|95 | |=1" | | | | | | | | | | | | | |/100 | | | | | | | | | | | | | |---------------+----------+-----+---+------+---+-----+---+-----+---+------+---+------+---+-------------+-----+---+------+---+-----+---+-----+---+------+---+-----+---| |"ext4devbarrier|8G |75403|99 |134676|16 |66865|12 |66554|92 |181388|21 |1030.5|2 |100:4096:4096|32130|73 |142664|100|64484|100|40271|92 |128563|100|51580|100| |=0" | | | | | | | | | | | | | |/100 | | | | | | | | | | | | | |---------------+----------+-----+---+------+---+-----+---+-----+---+------+---+------+---+-------------+-----+---+------+---+-----+---+-----+---+------+---+-----+---| |"ext3barrier=1"|8G |65788|93 |124678|28 |62124|14 |66092|88 |160675|18 |845.5 |1 |100:4096:4096|22824|51 |141891|99 |52747|75 |32728|74 |134353|99 |23597|43 | | | | | | | | | | | | | | | |/100 | | | | | | | | | | | | | |---------------+----------+-----+---+------+---+-----+---+-----+---+------+---+------+---+-------------+-----+---+------+---+-----+---+-----+---+------+---+-----+---| |"ext3barrier=0"|8G |64869|94 |123163|27 |62247|15 |68724|87 |160901|20 |853.7 |1 |100:4096:4096|24400|54 |143882|99 |66859|94 |20765|46 |114144|92 |35035|60 | | | | | | | | | | | | | | | |/100 | | | | | | | | | | | | | |---------------+----------+-----+---+------+---+-----+---+-----+---+------+---+------+---+-------------+-----+---+------+---+-----+---+-----+---+------+---+-----+---| |"ext2" |8G |76249|99 |136929|14 |60016|11 |71681|91 |158109|17 |834.5 |1 |100:4096:4096|59456|99 |199715|99 |42373|27 |52468|86 |176522|99 |10031|13 | | | | | | | | | | | | | | | |/100 | | | | | | | | | | | | | |---------------+----------+-----+---+------+---+-----+---+-----+---+------+---+------+---+-------------+-----+---+------+---+-----+---+-----+---+------+---+-----+---| |"xfsbarrier" |8G |75988|99 |124382|17 |65327|20 |72792|92 |184425|21 |996.4 |2 |100:4096:4096|6860 |39 |38303 |29 |13039|71 |6492 |38 |132674|100|3524 |28 | | | | | | | | | | | | | | | |/100 | | | | | | | | | | | | | |---------------+----------+-----+---+------+---+-----+---+-----+---+------+---+------+---+-------------+-----+---+------+---+-----+---+-----+---+------+---+-----+---| |"xfsnobarrier" |8G |72208|99 |124799|17 |64400|19 |72825|92 |184386|22 |960.3 |1 |100:4096:4096|5933 |30 |133819|98 |18497|90 |6454 |30 |106287|88 |1797 |13 | | | | | | | | | | | | | | | |/100 | | | | | | | | | | | | | +---------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+--------------------------------------------------------------------------------------------------------------------------------------+ | filesystem |factor|mkdir/|rmdir/|create|read/s |write/|close/s|stat/s|access|chmod/s|readdir|link/s|unlink/|delete|Total_files| | | | s | s | /s | | s | | | /s | | /s | | s | /s | | |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext4dev-barrier= | 50| 45660| 72072| 31151| 513890|109988| 558387|766035|832367| 383177| 24984| 97202| 166474| 62575| 125000| |1:Avg | | | | | | | | | | | | | | | | |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext4dev-barrier= | 50| 50372| 69784| 29774| 506736|108863| 362444|763301|827641| 382982| 24776| 98688| 164268| 61341| 125000| |0:Avg | | | | | | | | | | | | | | | | |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext3-barrier=0:Avg | 50| 5801| 88641| 4457| 552758| 67121| 350045|836085|829782| 414826| 24911|118080| 162170| 81961| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext3-barrier=1:Avg | 50| 5062| 88833| 5208| 555808| 66893| 353589|837415|830050| 412112| 25051|118031| 169053| 83226| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext2:Avg | 50| 775|147652| 93018|1287260|116034| 429009|789015|799868| 681526| 149540|202980| 392825|185121| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |xfs-barrier:Avg | 50| 41585| 44634| 31788| 944328|111678| 38517|721612|856858| 225775| 96316| 15177| 15912| 19375| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |xfs-nobarrier:Avg | 50| 38610| 43226| 32364| 971467|112631| 38262|722183|860511| 219324| 94674| 18636| 19874| 16624| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext4dev-barrier= | 50| 67650| 83886|139810|1048576|167772|1048576| -1| -1| 524288| 26379|209715| 349525| 77672| 125000| |1:Best | | | | | | | | | | | | | | | | |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext4dev-barrier= | 50| 66576| 77672|127100|1048576|167772|1048576| -1| -1|1048576| 26379|209715| 349525| 77672| 125000| |0:Best | | | | | | | | | | | | | | | | |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext3-barrier=0:Best| 50| 83886|113360|167772|1048576|113360|1048576| -1| -1|1048576| 26379|262144| 349525|113360| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext3-barrier=1:Best| 50| 83886|113360|167772|1048576|113360|1048576| -1| -1|1048576| 26379|262144| 349525|113360| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext2:Best | 50|167772|262144|322639| -1|209715| -1| -1| -1|1048576| 167772|466034|1048576|262144| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |xfs-barrier:Best | 50| 83886| 72316| 82241| -1|167772| 59075| -1| -1| 349525| 113360|113360| 144631| 34664| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |xfs-nobarrier:Best | 50| 83886| 72316| 77672| -1|167772| 59075| -1| -1| 349525| 113360|113360| 144631| 34664| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext4dev-barrier= | 50| 116| 23831| 663| 1053| 2208| 28728| 45590| 18893| 37118| 16132| 5| 6| 6| 125000| |1:Worst | | | | | | | | | | | | | | | | |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext4dev-barrier= | 50| 489| 17848| 58| 1447| 11619| 36792| 43691| 5047| 35545| 5746| 6| 6| 6| 125000| |0:Worst | | | | | | | | | | | | | | | | |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext3-barrier= | 50| 69| 24966| 70| 955| 1210| 43240| 27777| 1379| 41528| 7294| 6| 5| 6| 125000| |0:Worst | | | | | | | | | | | | | | | | |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext3-barrier= | 50| 66| 24385| 61| 5555| 12520| 45100| 40330| 4467| 31301| 8924| 6| 6| 6| 125000| |1:Worst | | | | | | | | | | | | | | | | |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |ext2:Worst | 50| 68| 32264| 1905| 932| 28728| 1202| 10538| 3638| 71090| 6288| 13487| 25575| 1653| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |xfs-barrier:Worst | 50| 110| 9259| 559| 4855| 16132| 2008| 12483| 4810| 10408| 12053| 1| 1| 17| 125000| |-------------------+------+------+------+------+-------+------+-------+------+------+-------+-------+------+-------+------+-----------| |xfs-nobarrier:Worst| 50| 182| 9001| 556| 1031| 22795| 6214| 66576| 2198| 136| 10645| 1| 1| 1| 125000| +--------------------------------------------------------------------------------------------------------------------------------------+
