diff options
| author |   Damjan Marion <damarion@cisco.com> | 2016-11-24 22:20:05 +0100 |
|---|---|---|
| committer |   Neale Ranns <nranns@cisco.com> | 2016-11-25 09:27:31 +0000 |
| commit | 30230dd7f854e77008b257c8be1de648e473338e (patch) | |
| tree | 53e99fc7b066593ae9672cfbb80511362c53b450 /vnet | |
| parent | 23a7412bda2c14b21deda66bc5555c9ee680dec8 (diff) | |
l2: fix latency issue casued by unnecesary read of previous cacheline
In majority of cases ethernet header sits at the beggining of cacheline.
Reading (dst_mac - 2) into 64 bit register is much more expensive
than doing simple bitwise shift, specially if previous cacheline is
not prefetched.
Change-Id: I35e53eae735098fb917a87c307e60a87e76e460f
Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'vnet')
| -rw-r--r-- | vnet/vnet/l2/l2_fib.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/vnet/vnet/l2/l2_fib.h b/vnet/vnet/l2/l2_fib.h index 8e7a52e4d02..63f394cfd44 100644 --- a/vnet/vnet/l2/l2_fib.h +++ b/vnet/vnet/l2/l2_fib.h @@ -105,7 +105,7 @@ l2fib_make_key (u8 * mac_address, u16 bd_index) * Create the in-register key as F:E:D:C:B:A:H:L * In memory the key is L:H:A:B:C:D:E:F */ - temp = *((u64 *) (mac_address - 2)); + temp = *((u64 *) (mac_address)) << 16; temp = (temp & ~0xffff) | (u64) (bd_index); #else /* |