25 Aug, 2011
18 commits
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Patch series 109f6e39..7361c36c back in 2.6.36 added functionality to
allow credentials to work across pid namespaces for packets sent via
UNIX sockets. However, the atomic reference counts on pid and
credentials caused plenty of cache bouncing when there are numerous
threads of the same pid sharing a UNIX socket. This patch mitigates the
problem by eliminating extraneous reference counts on pid and
credentials on both send and receive path of UNIX sockets. I found a 2x
improvement in hackbench's threaded case.On the receive path in unix_dgram_recvmsg, currently there is an
increment of reference count on pid and credentials in scm_set_cred.
Then there are two decrement of the reference counts. Once in scm_recv
and once when skb_free_datagram call skb->destructor function
unix_destruct_scm. One pair of increment and decrement of ref count on
pid and credentials can be eliminated from the receive path. Until we
destroy the skb, we already set a reference when we created the skb on
the send side.On the send path, there are two increments of ref count on pid and
credentials, once in scm_send and once in unix_scm_to_skb. Then there
is a decrement of the reference counts in scm_destroy's call to
scm_destroy_cred at the end of unix_dgram_sendmsg functions. One pair
of increment and decrement of the reference counts can be removed so we
only need to increment the ref counts once.By incorporating these changes, for hackbench running on a 4 socket
NHM-EX machine with 40 cores, the execution of hackbench on
50 groups of 20 threads sped up by factor of 2.Hackbench command used for testing:
./hackbench 50 thread 2000Signed-off-by: Tim Chen
Signed-off-by: David S. Miller -
With this patch a HEARTBEAT chunk is bundled into the ASCONF-ACK
for ADD IP ADDRESS, confirming the new destination as quickly as
possible.Signed-off-by: Michio Honda
Signed-off-by: David S. Miller -
This patch fixes BUG that the ASCONF receiver transmits DATA chunks
to the newly added UNCONFIRMED destination.Signed-off-by: Michio Honda
Signed-off-by: David S. Miller -
This patch implements Proportional Rate Reduction (PRR) for TCP.
PRR is an algorithm that determines TCP's sending rate in fast
recovery. PRR avoids excessive window reductions and aims for
the actual congestion window size at the end of recovery to be as
close as possible to the window determined by the congestion control
algorithm. PRR also improves accuracy of the amount of data sent
during loss recovery.The patch implements the recommended flavor of PRR called PRR-SSRB
(Proportional rate reduction with slow start reduction bound) and
replaces the existing rate halving algorithm. PRR improves upon the
existing Linux fast recovery under a number of conditions including:
1) burst losses where the losses implicitly reduce the amount of
outstanding data (pipe) below the ssthresh value selected by the
congestion control algorithm and,
2) losses near the end of short flows where application runs out of
data to send.As an example, with the existing rate halving implementation a single
loss event can cause a connection carrying short Web transactions to
go into the slow start mode after the recovery. This is because during
recovery Linux pulls the congestion window down to packets_in_flight+1
on every ACK. A short Web response often runs out of new data to send
and its pipe reduces to zero by the end of recovery when all its packets
are drained from the network. Subsequent HTTP responses using the same
connection will have to slow start to raise cwnd to ssthresh. PRR on
the other hand aims for the cwnd to be as close as possible to ssthresh
by the end of recovery.A description of PRR and a discussion of its performance can be found at
the following links:
- IETF Draft:
http://tools.ietf.org/html/draft-mathis-tcpm-proportional-rate-reduction-01
- IETF Slides:
http://www.ietf.org/proceedings/80/slides/tcpm-6.pdf
http://tools.ietf.org/agenda/81/slides/tcpm-2.pdf
- Paper to appear in Internet Measurements Conference (IMC) 2011:
Improving TCP Loss Recovery
Nandita Dukkipati, Matt Mathis, Yuchung ChengSigned-off-by: Nandita Dukkipati
Signed-off-by: David S. Miller -
1) Blocks can be configured with non-static frame-size.
2) Read/poll is at a block-level(as opposed to packet-level).
3) Added poll timeout to avoid indefinite user-space wait on idle links.
4) Added user-configurable knobs:
4.1) block::timeout.
4.2) tpkt_hdr::sk_rxhash.Changes:
C1) tpacket_rcv()
C1.1) packet_current_frame() is replaced by packet_current_rx_frame()
The bulk of the processing is then moved in the following chain:
packet_current_rx_frame()
__packet_lookup_frame_in_block
fill_curr_block()
or
retire_current_block
dispatch_next_block
or
return NULL(queue is plugged/paused)Signed-off-by: Chetan Loke
Signed-off-by: David S. Miller -
Added TPACKET_V3 definitions.
Signed-off-by: Chetan Loke
Signed-off-by: David S. Miller -
This patch provides base support for transmission of IPv6 packets as
well as the formation of IPv6 link-local addresses and statelessly
autoconfigured addresses on top of IEEE 802.15.4 networks.For more information please look at the RFC4944 "Compression Format
for IPv6 Datagrams in Low Power and Losst Networks (6LoWPAN).Signed-off-by: Alexander Smirnov
Signed-off-by: David S. Miller -
Signed-off-by: Ian Campbell
Cc: "David S. Miller"
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller -
Signed-off-by: Ian Campbell
Cc: "David S. Miller"
Cc: Alexey Kuznetsov
Cc: "Pekka Savola (ipv6)"
Cc: James Morris
Cc: Hideaki YOSHIFUJI
Cc: Patrick McHardy
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller -
Signed-off-by: Ian Campbell
Cc: "David S. Miller"
Cc: Alexey Kuznetsov
Cc: "Pekka Savola (ipv6)"
Cc: James Morris
Cc: Hideaki YOSHIFUJI
Cc: Patrick McHardy
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller -
Signed-off-by: Ian Campbell
Cc: "David S. Miller"
Cc: Eric Dumazet
Cc: "Michał Mirosław"
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller -
Signed-off-by: Sathya Perla
Signed-off-by: David S. Miller -
Flashing some of the PHYs can take longer thus increasing the total flash
update time to a max of 40s.Signed-off-by: Sathya Perla
Signed-off-by: David S. Miller -
The rx_drops_no_frags HW counter for RSS rings is 16bits in HW and can
wraparound often. Maintain a 32-bit accumulator in the driver to prevent
frequent wraparound.Also, incorporated Eric's feedback to use ACCESS_ONCE() for the accumulator
write.Signed-off-by: Sathya Perla
Signed-off-by: David S. Miller -
Get rid of adapter->pcicfg and its use. Use pci_config_read/write_dword()
instead.Signed-off-by: Sathya Perla
Signed-off-by: David S. Miller -
There is a possibility of be_post_rx_frags() being called simultaneously from
both be_worker() (when rx_post_starved) and be_poll_rx() (when rxq->used is 0).
This can be avoided by posting rx buffers only when some completions have been
reaped.Signed-off-by: Sathya Perla
Signed-off-by: David S. Miller -
Skip IPIP header to get proper layer-4 information.
Like GRE tunnels, this only works if rxhash is not already provided by
the device itself (ethtool -K ethX rxhash off), to allow kernel compute
a software rxhash.Signed-off-by: Eric Dumazet
Signed-off-by: David S. Miller
23 Aug, 2011
5 commits
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The primary aim is to add skb_frag_(ref|unref) in order to remove the use of
bare get/put_page on SKB pages fragments and to isolate users from subsequent
changes to the skb_frag_t data structure.Signed-off-by: Ian Campbell
Cc: "David S. Miller"
Cc: Eric Dumazet
Cc: "Michał Mirosław"
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller -
Now, when vlan tag on untagged in non-accelerated path is stripped from
skb, headers are reset right away. Benefit from that and avoid calling
__netif_receive_skb recursivelly and just use another_round.Signed-off-by: Jiri Pirko
Signed-off-by: David S. Miller -
We'll either hit one of the case labels or the default in the switch
and in all cases do we then 'goto out' and we also have a 'goto out'
after the switch that is redundant. Change to just use break in the
case statements and leave the 'goto out' after the lop for everyone to
hit.Signed-off-by: Jesper Juhl
Signed-off-by: David S. Miller -
…wireless-next into for-davem
Conflicts:
drivers/staging/ath6kl/miscdrv/ar3kps/ar3kpsparser.c
drivers/staging/ath6kl/os/linux/ar6000_drv.c
22 Aug, 2011
8 commits
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Signed-off-by: Marek Lindner
-
Signed-off-by: Marek Lindner
Acked-by: Antonio Quartulli -
Since clients can have several flags on or off, this patches make them
appear in the local/global transtable output so that they can be checked
for debugging purposes.Signed-off-by: Antonio Quartulli
Signed-off-by: Marek Lindner -
If a node has to send a packet issued by a WIFI client to another WIFI client,
the packet is dropped.Signed-off-by: Antonio Quartulli
Signed-off-by: Marek Lindner -
When a node receives a unicast packet it checks if the source and the
destination client can communicate or not due to the AP isolationSigned-off-by: Antonio Quartulli
Signed-off-by: Marek Lindner -
Clients connected through a 802.11 device are now marked with the
TT_CLIENT_WIFI flag. This flag is also advertised with the tt
announcement.Signed-off-by: Antonio Quartulli
Signed-off-by: Marek Lindner -
Several typos have been corrected and some sentences have been rephrased
Signed-off-by: Antonio Quartulli
Signed-off-by: Marek Lindner -
hash_add() returns 0 on success while returns -1 either on error and on
entry already present. The caller could use such information to select
its behaviour. For this reason it is useful that hash_add() returns -1
in case on error and returns 1 in case of entry already present.Signed-off-by: Antonio Quartulli
Signed-off-by: Marek Lindner
21 Aug, 2011
9 commits
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Conflicts:
drivers/net/ethernet/intel/e1000e/netdev.c -
Signed-off-by: Changli Gao
Signed-off-by: David S. Miller -
This change allows to get driver specific debug messages output
providing a module parameter. As far as the maximum level of verbosity
is too high, it is demoted by default.Signed-off-by: Vladimir Zapolskiy
Signed-off-by: David S. Miller -
This patch updates the tg3 version to 3.120.
Signed-off-by: Matt Carlson
Reviewed-by: Michael Chan
Signed-off-by: David S. Miller -
This patch adds external loopback support to tg3's ethtool selftest.
Signed-off-by: Matt Carlson
Reviewed-by: Michael Chan
Signed-off-by: David S. Miller -
The tg3_test_loopback() function is starting to get more complicated as
more loopback tests are added. This patch cleans up the code.Signed-off-by: Matt Carlson
Reviewed-by: Michael Chan
Signed-off-by: David S. Miller -
This patch pulls out the internal phy loopback setup code into a
separate function. This cleans up the loopback test code and makes it
available for NETIF_F_LOOPBACK support later.Signed-off-by: Matt Carlson
Reviewed-by: Michael Chan
Signed-off-by: David S. Miller -
The driver puts the device into MAC loopback in two places in the
driver. This patch consolidates the code into a single routine.Signed-off-by: Matt Carlson
Reviewed-by: Michael Chan
Signed-off-by: David S. Miller
