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| author | David S. Miller <davem@davemloft.net> | 2014-03-10 18:17:44 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-03-10 18:17:44 +0100 |
| commit | 19433646fec836f6804fd5409f8a89a5869d1c7d (patch) | |
| tree | 4c68117fd4bda6b8ac7e51eca82e5c59a24c1116 /drivers/net/ethernet/sfc/mcdi.c | |
| parent | vlan: use use ether_addr_equal_64bits to instead of ether_addr_equal (diff) | |
| parent | gianfar: Use Single-Queue polling for "fsl,etsec2" (diff) | |
| download | linux-19433646fec836f6804fd5409f8a89a5869d1c7d.tar.xz linux-19433646fec836f6804fd5409f8a89a5869d1c7d.zip | |
Merge branch 'gianfar-next'
Claudiu Manoil says:
====================
gianfar: Tx timeout issue
There's an older Tx timeout issue showing up on etsec2 devices
with 2 CPUs. I pinned this issue down to processing overhead
incurred by supporting multiple Tx/Rx rings, as explained in
the 2nd patch below. But before this, there's also a concurency
issue leading to Rx/Tx spurrious interrupts, addressed by the
'Tx NAPI' patch below.
The Tx timeout can be triggered with multiple Tx flows,
'iperf -c -N 8' commands, on a 2 CPUs etsec2 based (P1020) board.
Before the patches:
"""
root@p1020rdb-pc:~# iperf -c 172.16.1.3 -n 1000M -P 8 &
[...]
root@p1020rdb-pc:~# NETDEV WATCHDOG: eth1 (fsl-gianfar): transmit queue 1 timed out
WARNING: at net/sched/sch_generic.c:279
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.13.0-rc3-03386-g89ea59c #23
task: ed84ef40 ti: ed868000 task.ti: ed868000
NIP: c04627a8 LR: c04627a8 CTR: c02fb270
REGS: ed869d00 TRAP: 0700 Not tainted (3.13.0-rc3-03386-g89ea59c)
MSR: 00029000 <CE,EE,ME> CR: 44000022 XER: 20000000
[...]
root@p1020rdb-pc:~# [ ID] Interval Transfer Bandwidth
[ 5] 0.0-19.3 sec 1000 MBytes 434 Mbits/sec
[ 8] 0.0-39.7 sec 1000 MBytes 211 Mbits/sec
[ 9] 0.0-40.1 sec 1000 MBytes 209 Mbits/sec
[ 3] 0.0-40.2 sec 1000 MBytes 209 Mbits/sec
[ 10] 0.0-59.0 sec 1000 MBytes 142 Mbits/sec
[ 7] 0.0-74.6 sec 1000 MBytes 112 Mbits/sec
[ 6] 0.0-74.7 sec 1000 MBytes 112 Mbits/sec
[ 4] 0.0-74.7 sec 1000 MBytes 112 Mbits/sec
[SUM] 0.0-74.7 sec 7.81 GBytes 898 Mbits/sec
root@p1020rdb-pc:~# ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:04:9f:00:13:01
inet addr:172.16.1.1 Bcast:172.16.255.255 Mask:255.255.0.0
inet6 addr: fe80::204:9fff:fe00:1301/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:708722 errors:0 dropped:0 overruns:0 frame:0
TX packets:8717849 errors:6 dropped:0 overruns:1470 carrier:0
collisions:0 txqueuelen:1000
RX bytes:58118018 (55.4 MiB) TX bytes:274069482 (261.3 MiB)
Base address:0xa000
"""
After applying the patches:
"""
root@p1020rdb-pc:~# iperf -c 172.16.1.3 -n 1000M -P 8 &
[...]
root@p1020rdb-pc:~# [ ID] Interval Transfer Bandwidth
[ 9] 0.0-70.5 sec 1000 MBytes 119 Mbits/sec
[ 5] 0.0-70.5 sec 1000 MBytes 119 Mbits/sec
[ 6] 0.0-70.7 sec 1000 MBytes 119 Mbits/sec
[ 4] 0.0-71.0 sec 1000 MBytes 118 Mbits/sec
[ 8] 0.0-71.1 sec 1000 MBytes 118 Mbits/sec
[ 3] 0.0-71.2 sec 1000 MBytes 118 Mbits/sec
[ 10] 0.0-71.3 sec 1000 MBytes 118 Mbits/sec
[ 7] 0.0-71.3 sec 1000 MBytes 118 Mbits/sec
[SUM] 0.0-71.3 sec 7.81 GBytes 942 Mbits/sec
root@p1020rdb-pc:~# ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:04:9f:00:13:01
inet addr:172.16.1.1 Bcast:172.16.255.255 Mask:255.255.0.0
inet6 addr: fe80::204:9fff:fe00:1301/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:728446 errors:0 dropped:0 overruns:0 frame:0
TX packets:8690057 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:59732650 (56.9 MiB) TX bytes:271554306 (258.9 MiB)
Base address:0xa000
"""
v2: PATCH 2:
Replaced CPP check with run-time condition to
limit the number of queues. Updated comments.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sfc/mcdi.c')
0 files changed, 0 insertions, 0 deletions