* Re: [bug] forcedeth: hung interface under load
2007-04-03 7:05 ` [bug] forcedeth: hung interface under load Ingo Molnar
@ 2007-04-06 10:51 ` Ingo Molnar
0 siblings, 0 replies; 3+ messages in thread
From: Ingo Molnar @ 2007-04-06 10:51 UTC (permalink / raw)
To: Ayaz Abdulla; +Cc: akpm, jeff, netdev, linux-kernel, Adrian Bunk
[-- Attachment #1: Type: text/plain, Size: 3673 bytes --]
* 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);
}
[-- Attachment #2: eth0.dump --]
[-- Type: text/plain, Size: 14204 bytes --]
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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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