diff options
| author | John Lacombe <jlacombe@neteffect.com> | 2008-02-21 17:34:58 +0300 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2008-02-27 03:24:29 +0300 |
| commit | 4b1cc7e7ca5715907d17619dcb49144db6efe1c9 (patch) | |
| tree | 82e8617c051c3148d902476464e36b418cbe531c /drivers/infiniband/hw/nes/nes_hw.c | |
| parent | 30da7cff87f0ffa169fe07b766c3d6a5f6d1f6ab (diff) | |
| download | linux-4b1cc7e7ca5715907d17619dcb49144db6efe1c9.tar.xz | |
RDMA/nes: Fix interrupt moderation low threshold
Interrupt moderation low threshold value was incorrectly triggering,
indicating that the threshold should be lowered.
The impact was the timer was likely to become 40usecs and get stuck
there. The biggest side effect was too many interrupts and nonoptimal
performance.
Signed-off-by: John Lacombe <jlacombe@neteffect.com>
Signed-off-by: Glenn Streiff <gstreiff@neteffect.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/nes/nes_hw.c')
| -rw-r--r-- | drivers/infiniband/hw/nes/nes_hw.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/drivers/infiniband/hw/nes/nes_hw.c b/drivers/infiniband/hw/nes/nes_hw.c index 7c4c0fbf0abd..49e53e4c1ebe 100644 --- a/drivers/infiniband/hw/nes/nes_hw.c +++ b/drivers/infiniband/hw/nes/nes_hw.c @@ -156,15 +156,14 @@ static void nes_nic_tune_timer(struct nes_device *nesdev) spin_lock_irqsave(&nesadapter->periodic_timer_lock, flags); - if (shared_timer->cq_count_old < cq_count) { - if (cq_count > shared_timer->threshold_low) - shared_timer->cq_direction_downward=0; - } - if (shared_timer->cq_count_old >= cq_count) + if (shared_timer->cq_count_old <= cq_count) + shared_timer->cq_direction_downward = 0; + else shared_timer->cq_direction_downward++; shared_timer->cq_count_old = cq_count; if (shared_timer->cq_direction_downward > NES_NIC_CQ_DOWNWARD_TREND) { - if (cq_count <= shared_timer->threshold_low) { + if (cq_count <= shared_timer->threshold_low && + shared_timer->threshold_low > 4) { shared_timer->threshold_low = shared_timer->threshold_low/2; shared_timer->cq_direction_downward=0; nesdev->currcq_count = 0; @@ -1728,7 +1727,6 @@ int nes_napi_isr(struct nes_device *nesdev) nesdev->int_req &= ~NES_INT_TIMER; nes_write32(nesdev->regs+NES_INTF_INT_MASK, ~(nesdev->intf_int_req)); nes_write32(nesdev->regs+NES_INT_MASK, ~nesdev->int_req); - nesadapter->tune_timer.timer_in_use_old = 0; } nesdev->deepcq_count = 0; return 1; @@ -1867,7 +1865,6 @@ void nes_dpc(unsigned long param) nesdev->int_req &= ~NES_INT_TIMER; nes_write32(nesdev->regs + NES_INTF_INT_MASK, ~(nesdev->intf_int_req)); nes_write32(nesdev->regs+NES_INT_MASK, ~nesdev->int_req); - nesdev->nesadapter->tune_timer.timer_in_use_old = 0; } else { nes_write32(nesdev->regs+NES_INT_MASK, 0x0000ffff|(~nesdev->int_req)); } |