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4cce66cdd1
linux/drivers/net/ethernet
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Thadeu Lima de Souza Cascardo 4cce66cdd1 mlx4_en: map entire pages to increase throughput 
In its receive path, mlx4_en driver maps each page chunk that it pushes
to the hardware and unmaps it when pushing it up the stack. This limits
throughput to about 3Gbps on a Power7 8-core machine.

One solution is to map the entire allocated page at once. However, this
requires that we keep track of every page fragment we give to a
descriptor. We also need to work with the discipline that all fragments will
be released (in the sense that it will not be reused by the driver
anymore) in the order they are allocated to the driver.

This requires that we don't reuse any fragments, every single one of
them must be reallocated. We do that by releasing all the fragments that
are processed and only after finished processing the descriptors, we
start the refill.

We also must somehow guarantee that we either refill all fragments in a
descriptor or none at all, without resorting to giving up a page
fragment that we would have already given. Otherwise, we would break the
discipline of only releasing the fragments in the order they were
allocated.

This has passed page allocation fault injections (restricted to the
driver by using required-start and required-end) and device hotplug
while 16 TCP streams were able to deliver more than 9Gbps.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-19 10:53:13 -07:00
..
3com drivers/net/ethernet: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:46 -07:00
8390 net: add support for NS8390 based eth controllers on some ColdFire CPU boards 2012-07-12 07:54:45 -07:00
adaptec starfire: remove deprecated options. 2012-04-07 11:45:26 +02:00
adi bfin: Fix build failure due to get_ts_info() changes. 2012-04-06 00:17:50 -04:00
aeroflex ethernet: Remove casts to same type 2012-06-06 09:31:33 -07:00
alteon Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
amd lance: remove unnecessary setting of skb->dev 2012-07-10 23:24:56 -07:00
apple ethernet: Remove casts to same type 2012-06-06 09:31:33 -07:00
atheros ethernet: Use eth_random_addr 2012-07-16 22:38:27 -07:00
broadcom b44: add 64 bit stats 2012-07-18 09:29:43 -07:00
brocade drivers/net/ethernet: Fix non-kernel-doc comments with kernel-doc start markers 2012-07-10 23:13:46 -07:00
cadence net/macb: manage carrier state with call to netif_carrier_{on|off}() 2012-07-09 00:03:06 -07:00
calxeda net: calxedaxgmac: enable rx cut-thru mode 2012-07-10 23:25:47 -07:00
chelsio cxgb3: Set vlan_feature on net_device 2012-07-19 10:48:00 -07:00
cirrus cirrus: cs89x0: Remove function prototypes and reorder declarations 2012-05-18 23:48:07 -04:00
cisco enic: remove unnecessary setting of skb->dev 2012-07-10 23:24:56 -07:00
davicom dm9000: some coldfire boards need this 2012-05-14 18:40:16 -04:00
dec ethernet: Remove casts to same type 2012-06-06 09:31:33 -07:00
dlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-05-07 23:35:40 -04:00
emulex be2net: Ignore physical link async event for Lancer 2012-07-18 09:28:38 -07:00
faraday net: ftgmac100/ftmac100: dont pull too much data 2012-07-18 09:40:53 -07:00
freescale Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-07-10 23:56:33 -07:00
fujitsu drivers/net: delete all code/drivers depending on CONFIG_MCA 2012-05-17 16:37:41 -04:00
hp ethernet: Remove casts to same type 2012-06-06 09:31:33 -07:00
i825xx ethernet: Remove casts to same type 2012-06-06 09:31:33 -07:00
ibm drivers/net/ethernet: Fix non-kernel-doc comments with kernel-doc start markers 2012-07-10 23:13:46 -07:00
icplus
intel net: e100: ucode is optional in some cases 2012-07-19 10:48:07 -07:00
marvell sky2: Fix for interrupt handler 2012-07-09 00:05:40 -07:00
mellanox mlx4_en: map entire pages to increase throughput 2012-07-19 10:53:13 -07:00
micrel ethernet: Use eth_random_addr 2012-07-16 22:38:27 -07:00
microchip
myricom myri10ge: set maximal number of default RSS queues 2012-07-05 03:06:44 -07:00
natsemi drivers/net: delete all code/drivers depending on CONFIG_MCA 2012-05-17 16:37:41 -04:00
neterion vxge/s2io: remove dead URLs 2012-07-10 23:24:47 -07:00
nuvoton
nvidia drivers/net/ethernet: Fix non-kernel-doc comments with kernel-doc start markers 2012-07-10 23:13:46 -07:00
nxp lpc_eth: remove duplicated include 2012-07-16 22:16:40 -07:00
octeon
oki-semi drivers/net/ethernet: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:46 -07:00
packetengines yellowfin: stop using net_device.{base_addr, irq}. 2012-04-07 11:45:26 +02:00
pasemi net/pasemi: fix compiler warning 2012-05-02 20:52:48 -04:00
qlogic qlge: fix an "&&" vs "||" bug 2012-07-18 09:40:53 -07:00
racal
rdc r6040: use module_pci_driver macro 2012-07-09 14:42:30 -07:00
realtek r8169: verbose error message. 2012-07-17 23:34:06 +02:00
renesas net: sh_eth: add support for set_ringparam/get_ringparam 2012-06-27 01:24:16 -07:00
seeq Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
sfc sfc: initialize dynamic sysfs attributes for lockdep 2012-07-19 10:48:08 -07:00
sgi ethernet: Remove casts to same type 2012-06-06 09:31:33 -07:00
silan sc92031: stop using net_device.{base_addr, irq} 2012-04-07 11:45:27 +02:00
sis sis900: stop using net_device.{base_addr, irq} and convert to __iomem. 2012-04-07 11:47:18 +02:00
smsc ethernet: Use eth_random_addr 2012-07-16 22:38:27 -07:00
stmicro net: stmmac: Add ip version to dts bindings 2012-07-19 10:48:00 -07:00
sun sunhme: remove unnecessary setting of skb->dev 2012-07-10 23:24:57 -07:00
tehuti drivers/net/ethernet: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:46 -07:00
ti driver: net: ethernet: cpsw: runtime PM support 2012-07-18 09:40:54 -07:00
tile ethernet: Use eth_random_addr 2012-07-16 22:38:27 -07:00
toshiba drivers/net/ethernet: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:46 -07:00
tundra Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
via ethernet: Remove casts to same type 2012-06-06 09:31:33 -07:00
wiznet ethernet: Use eth_random_addr 2012-07-16 22:38:27 -07:00
xilinx ethernet: Use eth_random_addr 2012-07-16 22:38:27 -07:00
xircom Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
xscale net: remove ixp2000 ethernet driver 2012-04-04 18:09:37 -04:00
dnet.c dnet: Support the get_ts_info ethtool method. 2012-04-04 05:28:46 -04:00
dnet.h
ethoc.c ethernet: Use eth_random_addr 2012-07-16 22:38:27 -07:00
fealnx.c fealnx: Remove unused local label 'out' in netdev_open(). 2012-04-07 09:02:32 -04:00
jme.c jme: netpoll support 2012-07-18 09:40:54 -07:00
jme.h
Kconfig Ethernet driver for the WIZnet W5300 chip 2012-04-05 01:43:02 -04:00
korina.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
lantiq_etop.c ethernet: Use eth_random_addr 2012-07-16 22:38:27 -07:00
Makefile Ethernet driver for the WIZnet W5300 chip 2012-04-05 01:43:02 -04:00
mipsnet.c
netx-eth.c
s6gmac.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-05-22 19:22:50 -07:00