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SubjectRe: [bug] forcedeth: hung interface under load

* Ingo Molnar <mingo@elte.hu> wrote:

> > there's a different type of regression now: under high load i dont
> > get a crash, i get a hung interface instead. No error packets or
> > other weird interface state - just a hung interface. [...]
>
> the interface stats do not change from that point on:
>
> eth1 Link encap:Ethernet HWaddr 00:13:D4:DC:41:12
> inet addr:10.0.1.12 Bcast:10.0.1.255 Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:14976 errors:0 dropped:0 overruns:0 frame:0
> TX packets:3928743 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:1028544 (1004.4 KiB) TX bytes:4126766510 (3.8 GiB)
> Interrupt:16 Base address:0xa000
>
> and the irq count does not change either:
>
> 16: 816 3463148 IO-APIC-fasteoi eth1
>
> no matter what i do to the interface. So it's completely stuck. No
> kernel messages either - apparently nv_tx_timeout() never triggered.

i've attached an ethtool dump, ifconfig output, interrupts output and
lspci output of such a hang. Does the ethtool dump make any sense to
you? The driver is -rc6 plus the changes below. (but the hang looks
exactly the same that i got with an unmodified driver. the
optimization_tweak is a new change too - it drastically improves the
performance and scalability of the driver btw., by not letting it do
100-200K irqs/sec (!).)

Ingo

---------------->
Index: linux/drivers/net/forcedeth.c
===================================================================
--- linux.orig/drivers/net/forcedeth.c
+++ linux/drivers/net/forcedeth.c
@@ -800,7 +800,7 @@ struct fe_priv {
* Maximum number of loops until we assume that a bit in the irq mask
* is stuck. Overridable with module param.
*/
-static int max_interrupt_work = 5;
+static int max_interrupt_work = 50;

/*
* Optimization can be either throuput mode or cpu mode
@@ -812,7 +812,7 @@ enum {
NV_OPTIMIZATION_MODE_THROUGHPUT,
NV_OPTIMIZATION_MODE_CPU
};
-static int optimization_mode = NV_OPTIMIZATION_MODE_THROUGHPUT;
+static int optimization_mode = NV_OPTIMIZATION_MODE_CPU;

/*
* Poll interval for timer irq
@@ -1902,6 +1902,11 @@ static void nv_tx_done(struct net_device
np->stats.tx_carrier_errors++;
np->stats.tx_errors++;
} else {
+ if (!np->get_tx_ctx->skb) {
+ printk("get_tx: %ld, put_tx: %ld\n", (long)(np->get_tx_ctx - np->first_tx_ctx), (long)(np->put_tx_ctx - np->first_tx_ctx));
+ WARN_ON(1);
+ break;
+ }
np->stats.tx_packets++;
np->stats.tx_bytes += np->get_tx_ctx->skb->len;
}
@@ -1917,6 +1922,11 @@ static void nv_tx_done(struct net_device
np->stats.tx_carrier_errors++;
np->stats.tx_errors++;
} else {
+ if (!np->get_tx_ctx->skb) {
+ printk("get_tx: %ld, put_tx: %ld\n", (long)(np->get_tx_ctx - np->first_tx_ctx), (long)(np->put_tx_ctx - np->first_tx_ctx));
+ WARN_ON(1);
+ break;
+ }
np->stats.tx_packets++;
np->stats.tx_bytes += np->get_tx_ctx->skb->len;
}
@@ -3108,9 +3118,17 @@ static int nv_napi_poll(struct net_devic
int retcode;

if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
+ spin_lock_irqsave(&np->lock, flags);
+ nv_tx_done(dev);
+ spin_unlock_irqrestore(&np->lock, flags);
+
pkts = nv_rx_process(dev, limit);
retcode = nv_alloc_rx(dev);
} else {
+ spin_lock_irqsave(&np->lock, flags);
+ nv_tx_done_optimized(dev, np->tx_ring_size);
+ spin_unlock_irqrestore(&np->lock, flags);
+
pkts = nv_rx_process_optimized(dev, limit);
retcode = nv_alloc_rx_optimized(dev);
}Offset Value
-------- -----
00 0x72
01 0x00
02 0x00
03 0x00
04 0xe7
05 0x00
06 0x00
07 0x00
08 0x03
09 0x00
10 0x00
11 0x00
12 0x0d
13 0x00
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25 0x00
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27 0x00
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29 0x00
30 0x00
31 0x00
32 0x00
33 0x53
34 0x25
35 0x06
36 0x65
37 0x13
38 0x70
39 0xff
40 0x00
41 0x00
42 0x00
43 0x00
44 0x00
45 0x00
46 0x00
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48 0x00
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68 0x55
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155 0x00
156 0xa5
157 0x7f
158 0x00
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160 0x0f
161 0x05
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163 0x00
164 0x16
165 0x00
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170 0xd4
171 0xdc
172 0x41
173 0x12
174 0x00
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178 0x5e
179 0x00
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184 0xff
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258 0xa3
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272 0x32
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290 0xa3
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293 0x48
294 0x32
295 0x1a
296 0xeb
297 0xff
298 0x00
299 0xa0
300 0x10
301 0xc8
302 0x71
303 0x3e
304 0x1c
305 0x06
306 0x00
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313 0x67
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315 0x04
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318 0xe0
319 0x0f
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416 0x1e
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423 0x00
424 0x6d
425 0x79
426 0x94
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429 0x81
430 0x00
431 0x00
432 0x2a
433 0x01
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723 0x00

eth0 Link encap:Ethernet HWaddr 00:13:D4:DC:41:12
inet addr:10.0.1.12 Bcast:10.0.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10957 errors:0 dropped:0 overruns:0 frame:0
TX packets:14140 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:760457 (742.6 KiB) TX bytes:1881680 (1.7 MiB)
Interrupt:23 Base address:0xa000

00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
Subsystem: ASUSTeK Computer Inc. Unknown device 815a
Flags: bus master, 66MHz, fast devsel, latency 0
Capabilities: [44] HyperTransport: Slave or Primary Interface
Capabilities: [e0] HyperTransport: MSI Mapping

00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev a3)
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0

00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: 66MHz, fast devsel, IRQ 255
I/O ports at dc00 [size=32]
I/O ports at 4c00 [size=64]
I/O ports at 4c40 [size=64]
Capabilities: [44] Power Management version 2

00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2) (prog-if 10 [OHCI])
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 255
Memory at da102000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [44] Power Management version 2

00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3) (prog-if 20 [EHCI])
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 255
Memory at feb00000 (32-bit, non-prefetchable) [size=256]
Capabilities: [44] Debug port
Capabilities: [80] Power Management version 2

00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio Controller (rev a2)
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 3
I/O ports at d400 [size=256]
I/O ports at d800 [size=256]
Memory at da101000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [44] Power Management version 2

00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2) (prog-if 8a [Master SecP PriP])
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0
[virtual] Memory at 000001f0 (32-bit, non-prefetchable) [disabled] [size=8]
[virtual] Memory at 000003f0 (type 3, non-prefetchable) [disabled] [size=1]
[virtual] Memory at 00000170 (32-bit, non-prefetchable) [disabled] [size=8]
[virtual] Memory at 00000370 (type 3, non-prefetchable) [disabled] [size=1]
I/O ports at f000 [size=16]
Capabilities: [44] Power Management version 2

00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev a2) (prog-if 01 [Subtractive decode])
Flags: bus master, 66MHz, fast devsel, latency 0
Bus: primary=00, secondary=05, subordinate=05, sec-latency=128
I/O behind bridge: 0000c000-0000cfff
Memory behind bridge: da000000-da0fffff

00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev a3)
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 23
Memory at da100000 (32-bit, non-prefetchable) [size=4K]
I/O ports at d000 [size=8]
Capabilities: [44] Power Management version 2

00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
Capabilities: [40] Power Management version 2
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+
Capabilities: [58] HyperTransport: MSI Mapping
Capabilities: [80] Express Root Port (Slot+) IRQ 0
Capabilities: [100] Virtual Channel

00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
Capabilities: [40] Power Management version 2
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+
Capabilities: [58] HyperTransport: MSI Mapping
Capabilities: [80] Express Root Port (Slot+) IRQ 0
Capabilities: [100] Virtual Channel

00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
Capabilities: [40] Power Management version 2
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+
Capabilities: [58] HyperTransport: MSI Mapping
Capabilities: [80] Express Root Port (Slot+) IRQ 0
Capabilities: [100] Virtual Channel

00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 0000b000-0000bfff
Memory behind bridge: d8000000-d9ffffff
Prefetchable memory behind bridge: 00000000d0000000-00000000d7f00000
Capabilities: [40] Power Management version 2
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+
Capabilities: [58] HyperTransport: MSI Mapping
Capabilities: [80] Express Root Port (Slot+) IRQ 0
Capabilities: [100] Virtual Channel

00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
Flags: fast devsel
Capabilities: [80] HyperTransport: Host or Secondary Interface

00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
Flags: fast devsel

00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
Flags: fast devsel

00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
Flags: fast devsel

01:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60 [Radeon X300 (PCIE)] (prog-if 00 [VGA])
Subsystem: PC Partner Limited Unknown device 0500
Flags: bus master, fast devsel, latency 0, IRQ 5
Memory at d0000000 (32-bit, prefetchable) [size=128M]
I/O ports at b000 [size=256]
Memory at d9000000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at d8000000 [disabled] [size=128K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Express Endpoint IRQ 0
Capabilities: [80] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Capabilities: [100] Advanced Error Reporting

01:00.1 Display controller: ATI Technologies Inc RV370 [Radeon X300SE]
Subsystem: PC Partner Limited Unknown device 0501
Flags: fast devsel
Memory at d9010000 (32-bit, non-prefetchable) [disabled] [size=64K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Express Endpoint IRQ 0

05:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
Subsystem: Realtek Semiconductor Co., Ltd. RT8139
Flags: bus master, medium devsel, latency 32, IRQ 17
I/O ports at c000 [size=256]
Memory at da000000 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2

CPU0 CPU1
0: 782 0 IO-APIC-edge timer
1: 0 8 IO-APIC-edge i8042
4: 1 1714 IO-APIC-edge serial
8: 0 0 IO-APIC-edge rtc
9: 0 0 IO-APIC-fasteoi acpi
12: 6 99 IO-APIC-edge i8042
14: 31560 6886 IO-APIC-edge ide0
17: 0 0 IO-APIC-fasteoi eth1
23: 209 2043903 IO-APIC-fasteoi eth0
NMI: 0 0
LOC: 72842 78904
ERR: 0
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