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| author | Jesse Brandeburg <jesse.brandeburg@intel.com> | 2010-09-29 21:38:49 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-09-30 17:59:31 -0700 |
| commit | 3a3b75860527a11ba5035c6aa576079245d09e2a (patch) | |
| tree | 0dbd487fe8910a02c39ab4f84da6d16ebe6d29e3 /drivers/net/e1000e/defines.h | |
| parent | 6af3b9ebfea38d0a057fbd7bdcecc61ac5662f02 (diff) | |
| download | op-kernel-dev-3a3b75860527a11ba5035c6aa576079245d09e2a.zip op-kernel-dev-3a3b75860527a11ba5035c6aa576079245d09e2a.tar.gz | |
e1000e: use hardware writeback batching
Most e1000e parts support batching writebacks. The problem with this is
that when some of the TADV or TIDV timers are not set, Tx can sit forever.
This is solved in this patch with write flushes using the Flush Partial
Descriptors (FPD) bit in TIDV and RDTR.
This improves bus utilization and removes partial writes on e1000e,
particularly from 82571 parts in S5500 chipset based machines.
Only ES2LAN and 82571/2 parts are included in this optimization, to reduce
testing load.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Emil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/e1000e/defines.h')
| -rw-r--r-- | drivers/net/e1000e/defines.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/e1000e/defines.h b/drivers/net/e1000e/defines.h index 93b3bed..d3f7a9c 100644 --- a/drivers/net/e1000e/defines.h +++ b/drivers/net/e1000e/defines.h @@ -446,7 +446,9 @@ /* Transmit Descriptor Control */ #define E1000_TXDCTL_PTHRESH 0x0000003F /* TXDCTL Prefetch Threshold */ +#define E1000_TXDCTL_HTHRESH 0x00003F00 /* TXDCTL Host Threshold */ #define E1000_TXDCTL_WTHRESH 0x003F0000 /* TXDCTL Writeback Threshold */ +#define E1000_TXDCTL_GRAN 0x01000000 /* TXDCTL Granularity */ #define E1000_TXDCTL_FULL_TX_DESC_WB 0x01010000 /* GRAN=1, WTHRESH=1 */ #define E1000_TXDCTL_MAX_TX_DESC_PREFETCH 0x0100001F /* GRAN=1, PTHRESH=31 */ /* Enable the counting of desc. still to be processed. */ |
