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NIU: Implement discard counters, optimize

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Optimize the lightly loaded case, by only synchronizing discards stats
when qlen > 10 indicate potential for drops.

Notice Robert Olsson might disagree with this patch.

Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2008-12-18 19:51:56 -08:00 committed by David S. Miller
parent d231776fda
commit e98def1f71
1 changed files with 3 additions and 1 deletions
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drivers/net/niu.c
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@ -3618,6 +3618,8 @@ static int niu_rx_work(struct niu *np, struct rx_ring_info *rp, int budget)
nw64(RX_DMA_CTL_STAT(rp->rx_channel), stat); nw64(RX_DMA_CTL_STAT(rp->rx_channel), stat);
/* Only sync discards stats when qlen indicate potential for drops */
if (qlen > 10)
niu_sync_rx_discard_stats(np, rp, 0x7FFF); niu_sync_rx_discard_stats(np, rp, 0x7FFF);
return work_done; return work_done;