[LU-291] echo client to use obd_brw_async

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.1.0
• Affects Version/s: Lustre 2.0.0
• Bugzilla ID: 18,225

Epic

obdecho

• Assignee: Lai Siyao
• Reporter: Lai Siyao

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.