Re: [PATCH v1] ixgbe: remove vector pmd burst size restriction

-----Original Message-----
From: Liang, Cunming
Sent: Friday, July 31, 2015 9:18 AM
To: dev@dpdk.org
Cc: Ananyev, Konstantin; Liang, Cunming
Subject: [PATCH v1] ixgbe: remove vector pmd burst size restriction

The patch removes the restriction of burst size on a constant 32.

On receive side, the burst size floor now aligns to RTE_IXGBE_DESCS_PER_LOOP power of 2.
According to this rule, the burst size less than 4 still won't receive anything.
(Before this change, the burst size less than 32 can't receive anything.)

On transmit side, the max burst size no longer bind with a constant, however it still
require to check the cross tx_rs_thresh violation.

There's no obvious performance drop found on both recv_pkts_vec
and recv_scattered_pkts_vec on burst size 32.

Signed-off-by: Cunming Liang <redacted>
---

Acked-by: Konstantin Ananyev <redacted>