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  1. 10 11月, 2011 1 次提交
    • E
      ipv4: reduce percpu needs for icmpmsg mibs · acb32ba3
      由 Eric Dumazet 提交于 
      Reading /proc/net/snmp on a machine with a lot of cpus is very expensive
(can be ~88000 us).

This is because ICMPMSG MIB uses 4096 bytes per cpu, and folding values
for all possible cpus can read 16 Mbytes of memory.

ICMP messages are not considered as fast path on a typical server, and
eventually few cpus handle them anyway. We can afford an atomic
operation instead of using percpu data.

This saves 4096 bytes per cpu and per network namespace.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      acb32ba3
  3. 09 11月, 2011 4 次提交
  5. 04 11月, 2011 1 次提交
  7. 02 11月, 2011 2 次提交
  9. 01 11月, 2011 3 次提交
  11. 27 10月, 2011 1 次提交
  13. 25 10月, 2011 2 次提交
  15. 24 10月, 2011 5 次提交
  17. 22 10月, 2011 1 次提交
  19. 21 10月, 2011 5 次提交
  21. 20 10月, 2011 2 次提交
  23. 19 10月, 2011 3 次提交
  25. 14 10月, 2011 1 次提交
    • E
      net: more accurate skb truesize · 87fb4b7b
      由 Eric Dumazet 提交于 
      skb truesize currently accounts for sk_buff struct and part of skb head.
kmalloc() roundings are also ignored.

Considering that skb_shared_info is larger than sk_buff, its time to
take it into account for better memory accounting.

This patch introduces SKB_TRUESIZE(X) macro to centralize various
assumptions into a single place.

At skb alloc phase, we put skb_shared_info struct at the exact end of
skb head, to allow a better use of memory (lowering number of
reallocations), since kmalloc() gives us power-of-two memory blocks.

Unless SLUB/SLUB debug is active, both skb->head and skb_shared_info are
aligned to cache lines, as before.

Note: This patch might trigger performance regressions because of
misconfigured protocol stacks, hitting per socket or global memory
limits that were previously not reached. But its a necessary step for a
more accurate memory accounting.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
CC: Andi Kleen <ak@linux.intel.com>
CC: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      87fb4b7b
  27. 13 10月, 2011 1 次提交
  29. 12 10月, 2011 1 次提交
  31. 05 10月, 2011 2 次提交
    • Y
      tcp: properly update lost_cnt_hint during shifting · 1e5289e1
      由 Yan, Zheng 提交于 
      lost_skb_hint is used by tcp_mark_head_lost() to mark the first unhandled skb.
lost_cnt_hint is the number of packets or sacked packets before the lost_skb_hint;
When shifting a skb that is before the lost_skb_hint, if tcp_is_fack() is ture,
the skb has already been counted in the lost_cnt_hint; if tcp_is_fack() is false,
tcp_sacktag_one() will increase the lost_cnt_hint. So tcp_shifted_skb() does not
need to adjust the lost_cnt_hint by itself. When shifting a skb that is equal to
lost_skb_hint, the shifted packets will not be counted by tcp_mark_head_lost().
So tcp_shifted_skb() should adjust the lost_cnt_hint even tcp_is_fack(tp) is true.
Signed-off-by: NZheng Yan <zheng.z.yan@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      1e5289e1
    • Y
      tcp: properly handle md5sig_pool references · 260fcbeb
      由 Yan, Zheng 提交于 
      tcp_v4_clear_md5_list() assumes that multiple tcp md5sig peers
only hold one reference to md5sig_pool. but tcp_v4_md5_do_add()
increases use count of md5sig_pool for each peer. This patch
makes tcp_v4_md5_do_add() only increases use count for the first
tcp md5sig peer.
Signed-off-by: NZheng Yan <zheng.z.yan@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      260fcbeb
  33. 04 10月, 2011 2 次提交
  35. 28 9月, 2011 1 次提交
  37. 27 9月, 2011 2 次提交