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ixgbe: Remove code that was initializing Rx page offset 

This change reverts an earlier patch that introduced
ixgbe_init_rx_page_offset. The idea behind the function was to provide
some variation in the starting offset for the page in order to reduce
hot-spots in the cache. However it doesn't appear to provide any
significant benefit in the testing I have done. It has however been a
source of several bugs, and it blocks us from being able to use 2K
fragments on larger page sizes. So the decision I made was to remove it.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
This commit is contained in:
Alexander Duyck 2012-07-20 08:08:12 +00:00 committed by Peter P Waskiewicz Jr
parent 02644a1745
commit afaa9459de
1 changed files with 1 additions and 26 deletions
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27
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -1167,7 +1167,7 @@ static bool ixgbe_alloc_mapped_page(struct ixgbe_ring *rx_ring,
}
bi->dma = dma;
bi->page_offset ^= ixgbe_rx_bufsz(rx_ring);
bi->page_offset = 0;
return true;
}
@ -4129,27 +4129,6 @@ void ixgbe_reset(struct ixgbe_adapter *adapter)
hw->mac.ops.set_vmdq_san_mac(hw, VMDQ_P(0));
}
/**
* ixgbe_init_rx_page_offset - initialize page offset values for Rx buffers
* @rx_ring: ring to setup
*
* On many IA platforms the L1 cache has a critical stride of 4K, this
* results in each receive buffer starting in the same cache set. To help
* reduce the pressure on this cache set we can interleave the offsets so
* that only every other buffer will be in the same cache set.
**/
static void ixgbe_init_rx_page_offset(struct ixgbe_ring *rx_ring)
{
struct ixgbe_rx_buffer *rx_buffer = rx_ring->rx_buffer_info;
u16 i;
for (i = 0; i < rx_ring->count; i += 2) {
rx_buffer[0].page_offset = 0;
rx_buffer[1].page_offset = ixgbe_rx_bufsz(rx_ring);
rx_buffer = &rx_buffer[2];
}
}
/**
* ixgbe_clean_rx_ring - Free Rx Buffers per Queue
* @rx_ring: ring to free buffers from
@ -4195,8 +4174,6 @@ static void ixgbe_clean_rx_ring(struct ixgbe_ring *rx_ring)
size = sizeof(struct ixgbe_rx_buffer) * rx_ring->count;
memset(rx_ring->rx_buffer_info, 0, size);
ixgbe_init_rx_page_offset(rx_ring);
/* Zero out the descriptor ring */
memset(rx_ring->desc, 0, rx_ring->size);
@ -4646,8 +4623,6 @@ int ixgbe_setup_rx_resources(struct ixgbe_ring *rx_ring)
rx_ring->next_to_clean = 0;
rx_ring->next_to_use = 0;
ixgbe_init_rx_page_offset(rx_ring);
return 0;
err:
vfree(rx_ring->rx_buffer_info);