| commit | 5c97f6d48701d464dfd6e8782399383686603b65 | |
| author | Ben Hutchings <bhutchings@solarflare.com> | |
| Thu, 1 Sep 2011 12:09:29 +0000 (1 12:09 +0000) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Mon, 3 Oct 2011 18:40:53 +0000 (3 11:40 -0700) | ||
| tree | a72acce8629e6493afd31981d0f38e08bb1e243d | treesnapshot (tar.gz zip) |
| parent | 621ad27ca68f318db0d416e5c1401d35c95c6d91 | commitdiff |
Revert "sfc: Use write-combining to reduce TX latency" and follow-ups
[ Upstream commit 86c432ca5d6da90a26ac8d3e680f2268b502d9c5 ]
This reverts commits 65f0b417dee94f779ce9b77102b7d73c93723b39,
d88d6b05fee3cc78e5b0273eb58c31201dcc6b76,
fcfa060468a4edcf776f0c1211d826d5de1668c1,
747df2258b1b9a2e25929ef496262c339c380009 and
867955f5682f7157fdafe8670804b9f8ea077bc7.
Depending on the processor model, write-combining may result in
reordering that the NIC will not tolerate. This typically results
in a DMA error event and reset by the driver, logged as:
sfc 0000:0e:00.0: eth2: TX DMA Q reports TX_EV_PKT_ERR.
sfc 0000:0e:00.0: eth2: resetting (ALL)
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
[ Upstream commit 86c432ca5d6da90a26ac8d3e680f2268b502d9c5 ]
This reverts commits 65f0b417dee94f779ce9b77102b7d73c93723b39,
d88d6b05fee3cc78e5b0273eb58c31201dcc6b76,
fcfa060468a4edcf776f0c1211d826d5de1668c1,
747df2258b1b9a2e25929ef496262c339c380009 and
867955f5682f7157fdafe8670804b9f8ea077bc7.
Depending on the processor model, write-combining may result in
reordering that the NIC will not tolerate. This typically results
in a DMA error event and reset by the driver, logged as:
sfc 0000:0e:00.0: eth2: TX DMA Q reports TX_EV_PKT_ERR.
sfc 0000:0e:00.0: eth2: resetting (ALL)
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>