Patchset improves RX path handling in rtlwifi/usb.c by:
- change to use preallocated DMA coherent URB buffers.
- kill unnessasary skbuff copies.
- defer RX processing to tasklet.
- add proper alignment of skbuff early on.
With this patchset IRQ CPU usage drops from 37% to 25% on ARM system with
1Ghz Cortex-A8, when doing large transfer with rtl8192cu. Tranfer speed
appears to be slightly improved too, from 29Mbit to 31Mbit.
---
Jussi Kivilinna (4):
rtlwifi: usb: use usb_alloc_coherent for RX buffers
rtlwifi: usb: remove extra skb copy on RX path
rtlwifi: usb: defer rx processing to tasklet
rtlwifi: usb: add NET_IP_ALIGN padding to RX skb when needed
drivers/net/wireless/rtlwifi/rtl8192cu/trx.c | 2
drivers/net/wireless/rtlwifi/usb.c | 220 ++++++++++++++++++--------
drivers/net/wireless/rtlwifi/usb.h | 5 -
3 files changed, 156 insertions(+), 71 deletions(-)
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