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    Subject[v2.6.34-stable 057/213] net: reduce net_rx_action() latency to 2 HZ
    Date
    From: Eric Dumazet <edumazt@google.com>

    -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
    -------------------

    commit d1f41b67ff7735193bc8b418b98ac99a448833e2 upstream.

    We should use time_after_eq() to get maximum latency of two ticks,
    instead of three.

    Bug added in commit 24f8b2385 (net: increase receive packet quantum)

    Signed-off-by: Eric Dumazet <edumazet@google.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
    ---
    net/core/dev.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/net/core/dev.c b/net/core/dev.c
    index 2aaf2e610f92..253b409fe3ab 100644
    --- a/net/core/dev.c
    +++ b/net/core/dev.c
    @@ -3045,7 +3045,7 @@ static void net_rx_action(struct softirq_action *h)
    * Allow this to run for 2 jiffies since which will allow
    * an average latency of 1.5/HZ.
    */
    - if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
    + if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit)))
    goto softnet_break;

    local_irq_enable();
    --
    1.8.5.2


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