On 1/9/20 10:08 PM, Theodore Y. Ts'o wrote:
On Thu, Jan 09, 2020 at 02:51:42PM +0530, Ritesh Harjani wrote:
Dbench was slightly impacted; I didn't see any real differences with
compilebench or postmark. dioread_nolock did improve fio with
sequential reads; which is interesting, since I would have expected
IIUC, this Seq. read numbers are with --direct=1 & bs=2MB & ioengine=libaio,
correct?
So essentially it will do a DIO AIO sequential read.
Correct.
I too collected some performance numbers on my x86 box with
--direct=1, bs=4K/1M & ioengine=libaio, with default opt v/s
dioread_nolock opt on latest ext4 git tree.
I found the delta to be within +/- 6% in all of the runs which includes,
seq read, mixed rw & mixed randrw.
-ritesh
