On Fri, May 03 2013, Jens Axboe wrote: > On Fri, May 03 2013, Michel Jansens wrote: > > Hi, > > > > I'm trying out FIO, and rand a random read job with a 12GB file. It > > seems that the "Laying out IO file(s) " process generates a > > zero-filled file. This means that when compression is activated (on > > ZFS), no reads actually happens. > > > > I tried adding a "buffer_compress_percentage=10" section to tell > > generated data should compress from only "10%" but this seems to apply > > only to actual benchmark job, not the 'laying out file's. > > > > Am I missing something? > > No, it currently just fills zeroes. It's trivial to make it honor the > usual buffer fill logic, though. With the below patch, it'll do what fio > otherwise would have done to IO buffers during the benchmark run. Since the followups didn't make it here, the below exposed a bug in the compression logic where it would loop infinitely if compress_chunk wasn't set too. So we got a new feature, and a fix for an older bug as well. Commit is here: http://git.kernel.dk/?p=fio.git;a=commit;h=cc86c395fd9dd2002ec1edc0967b7c9453debdfb -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
