From e493ceaeccfaebda9d30435cbbe30e97058313a7 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 25 Jan 2021 14:06:48 -0700 Subject: [PATCH] HOWTO: add sg 'hipri' option Signed-off-by: Jens Axboe --- HOWTO | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/HOWTO b/HOWTO index 372f268f..3ec86aff 100644 --- a/HOWTO +++ b/HOWTO @@ -2359,6 +2359,18 @@ with the caveat that when used on the command line, they must come after the transferred to the device. The writefua option is ignored with this selection. +.. option:: hipri : [sg] + + If this option is set, fio will attempt to use polled IO completions. + This will have a similar effect as (io_uring)hipri. Only SCSI READ and + WRITE commands will have the SGV4_FLAG_HIPRI set (not UNMAP (trim) nor + VERIFY). Older versions of the Linux sg driver that do not support + hipri will simply ignore this flag and do normal IO. The Linux SCSI + Low Level Driver (LLD) that "owns" the device also needs to support + hipri (also known as iopoll and mq_poll). The MegaRAID driver is an + example of a SCSI LLD. Default: clear (0) which does normal + (interrupted based) IO. + .. option:: http_host=str : [http] Hostname to connect to. For S3, this could be the bucket hostname. -- 2.25.1