[LU-291] echo client to use obd_brw_async

• Status: Resolved
• Project: Lustre
• Affects Version/s: Lustre 2.0.0
• Fix Version/s: Lustre 2.1.0
• Type: Improvement
• Priority: Minor
• Reporter: Lai Siyao
• Assignee: Lai Siyao
• Resolution: Fixed
• Bugzilla ID: 18,225
• Epic: obdecho

Description

Right now the echo_client is using obd_brw(), preventing it from getting multiple RPCs in flight
for a single transfer. This hurts performance testing requests > 1 MB in size.

Comments

[Mikhail Pershin]

The echo_client uses obd_brw() only for 'disk' mode, e.g. when echo client is sitting on top of obdfilter, so there is no network requests at all.
In network mode the cl_echo_object_brw() is used and it is asynchronous. Therefore is must have multiple RPCs in flight. Maybe there is another reason for bad performance?

[Jinshan Xiong (Inactive)]

I agree with tappro.

[Lai Siyao]

clio has implemented this functionality, nothing needs to be done for master.