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  1. 17 1月, 2012 5 次提交
  3. 17 12月, 2011 2 次提交
  5. 15 12月, 2011 1 次提交
  7. 14 12月, 2011 1 次提交
  9. 09 12月, 2011 1 次提交
  11. 08 12月, 2011 1 次提交
  13. 07 12月, 2011 6 次提交
  15. 04 12月, 2011 1 次提交
  17. 30 11月, 2011 2 次提交
  19. 29 11月, 2011 9 次提交
  21. 24 11月, 2011 2 次提交
  23. 17 11月, 2011 2 次提交
  25. 15 11月, 2011 2 次提交
    • D
      bnx2x: add endline at end of message · 5219e4c9
      由 Dmitry Kravkov 提交于 
      Reported-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      5219e4c9
    • E
      bnx2x: uses build_skb() in receive path · e52fcb24
      由 Eric Dumazet 提交于 
      bnx2x uses following formula to compute its rx_buf_sz :

dev->mtu + 2*L1_CACHE_BYTES + 14 + 8 + 8 + 2

Then core network adds NET_SKB_PAD and SKB_DATA_ALIGN(sizeof(struct
skb_shared_info))

Final allocated size for skb head on x86_64 (L1_CACHE_BYTES = 64,
MTU=1500) : 2112 bytes : SLUB/SLAB round this to 4096 bytes.

Since skb truesize is then bigger than SK_MEM_QUANTUM, we have lot of
false sharing because of mem_reclaim in UDP stack.

One possible way to half truesize is to reduce the need by 64 bytes
(2112 -> 2048 bytes)

Instead of allocating a full cache line at the end of packet for
alignment, we can use the fact that skb_shared_info sits at the end of
skb->head, and we can use this room, if we convert bnx2x to new
build_skb() infrastructure.

skb_shared_info will be initialized after hardware finished its
transfert, so we can eventually overwrite the final padding.

Using build_skb() also reduces cache line misses in the driver, since we
use cache hot skb instead of cold ones. Number of in-flight sk_buff
structures is lower, they are recycled while still hot.

Performance results :

(820.000 pps on a rx UDP monothread benchmark, instead of 720.000 pps)
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
CC: Eilon Greenstein <eilong@broadcom.com>
CC: Ben Hutchings <bhutchings@solarflare.com>
CC: Tom Herbert <therbert@google.com>
CC: Jamal Hadi Salim <hadi@mojatatu.com>
CC: Stephen Hemminger <shemminger@vyatta.com>
CC: Thomas Graf <tgraf@infradead.org>
CC: Herbert Xu <herbert@gondor.apana.org.au>
CC: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: NEilon Greenstein <eilong@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      e52fcb24
  27. 14 11月, 2011 5 次提交