X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=HOWTO;h=3af491325d3324b69117cc946728d7cd23ab8060;hb=d87612ac34a3cf1ac94a9ddc0cada672b6541b3c;hp=0c243076ef65be503d7fc17d63ba4f7737182ec9;hpb=d2e268b09bc8ab95af81e5636608dcd93f40e4c1;p=fio.git diff --git a/HOWTO b/HOWTO index 0c243076..3af49132 100644 --- a/HOWTO +++ b/HOWTO @@ -343,6 +343,9 @@ ioengine=str Defines how the job issues io to the file. The following or receive, if the latter only the port argument is used. + netsplice Like net, but uses splice/vmsplice to + map data and send/receive. + cpu Doesn't transfer any data, but burns CPU cycles according to the cpuload= and cpucycle= options. Setting cpuload=85 @@ -723,7 +726,10 @@ runt= The runtime of that thread slat= Submission latency (avg being the average, stdev being the standard deviation). This is the time it took to submit the io. For sync io, the slat is really the completion - latency, since queue/complete is one operation there. + latency, since queue/complete is one operation there. This + value can be in miliseconds or microseconds, fio will choose + the most appropriate base and print that. In the example + above, miliseconds is the best scale. clat= Completion latency. Same names as slat, this denotes the time from submission to completion of the io pieces. For sync io, clat will usually be equal (or very close) to 0,