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Date: Tue, 5 Aug 2008 10:47:15 +0300
From: Denys Fedoryshchenko <denys@...p.net.lb>
To: netdev@...r.kernel.org
Subject: thousands of classes, e1000 TX unit hang
I did script, that looks something like this (to simulate SFQ by flow
classifier):
$2 (is ppp interface)
echo "qdisc del dev $2 root ">>${TEMP}
echo "qdisc add dev $2 root handle 1: htb ">>${TEMP}
echo "filter add dev $2 protocol ip pref 16 parent 1: u32 \
match ip dst 0.0.0.0/0 police rate 8kbit burst 2048kb \
peakrate 1024Kbit mtu 10000 \
conform-exceed continue/ok">>${TEMP}
echo "filter add dev $2 protocol ip pref 32 parent 1: handle 1 \
flow hash keys nfct divisor 128 baseclass 1:2">>${TEMP}
echo "class add dev $2 parent 1: classid 1:1 htb \
rate ${rate}bit ceil ${rate}Kbit quantum 1514">>${TEMP}
#Cycle to add 128 classes
maxslot=130
for slot in `seq 2 $maxslot`; do
echo "class add dev $2 parent 1:1 classid 1:$slot htb \
rate 8Kbit ceil 256Kbit quantum 1514">>${TEMP}
echo "qdisc add dev $2 handle $slot: parent 1:$slot bfifo limit 3000">>${TEMP}
done
After adding around 400-450 interfaces (ppp) server start to "crack". Sure
there is packetloss to eth0 (but there is no filters or shapers on it). Even
deleting all classes becomes a challenge. After deleting all root handles on
ppp interfaces - it becomes ok.
Traffic over host is 15-20Mbit/s at that moment, it is 1 CPU Xeon 3.0 Ghz on
server motherboard SE7520 with 1GB ram available (at moment of testing more
than 512Mb was free).
Kernel is 2.6.26.1-vanilla
Anything else i need to add to info?
Error message appearing in dmesg:
[149650.006939] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149650.006943] Tx Queue <0>
[149650.006944] TDH <a3>
[149650.006945] TDT <a3>
[149650.006947] next_to_use <a3>
[149650.006948] next_to_clean <f8>
[149650.006949] buffer_info[next_to_clean]
[149650.006951] time_stamp <8e69a7c>
[149650.006952] next_to_watch <f8>
[149650.006953] jiffies <8e6a111>
[149650.006954] next_to_watch.status <1>
[149655.964100] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149655.964104] Tx Queue <0>
[149655.964105] TDH <6c>
[149655.964107] TDT <6c>
[149655.964108] next_to_use <6c>
[149655.964109] next_to_clean <c1>
[149655.964111] buffer_info[next_to_clean]
[149655.964112] time_stamp <8e6b198>
[149655.964113] next_to_watch <c1>
[149655.964115] jiffies <8e6b853>
[149655.964116] next_to_watch.status <1>
[149666.765110] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149666.765110] Tx Queue <0>
[149666.765110] TDH <28>
[149666.765110] TDT <28>
[149666.765110] next_to_use <28>
[149666.765110] next_to_clean <7e>
[149666.765110] buffer_info[next_to_clean]
[149666.765110] time_stamp <8e6db6a>
[149666.765110] next_to_watch <7e>
[149666.765110] jiffies <8e6e27f>
[149666.765110] next_to_watch.status <1>
[149668.629051] e1000: eth1: e1000_clean_tx_irq: Detected Tx Unit Hang
[149668.629056] Tx Queue <0>
[149668.629058] TDH <1b>
[149668.629060] TDT <1b>
[149668.629062] next_to_use <1b>
[149668.629064] next_to_clean <f1>
[149668.629066] buffer_info[next_to_clean]
[149668.629068] time_stamp <8e6e4c3>
[149668.629070] next_to_watch <f1>
[149668.629072] jiffies <8e6e9c7>
[149668.629074] next_to_watch.status <1>
[149676.606031] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149676.606035] Tx Queue <0>
[149676.606037] TDH <9b>
[149676.606038] TDT <9b>
[149676.606039] next_to_use <9b>
[149676.606040] next_to_clean <f0>
[149676.606042] buffer_info[next_to_clean]
[149676.606043] time_stamp <8e7024c>
[149676.606044] next_to_watch <f0>
[149676.606046] jiffies <8e708eb>
[149676.606047] next_to_watch.status <1>
[149680.151750] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149680.151750] Tx Queue <0>
[149680.151750] TDH <84>
[149680.151750] TDT <84>
[149680.151750] next_to_use <84>
[149680.151750] next_to_clean <d9>
[149680.151750] buffer_info[next_to_clean]
[149680.151750] time_stamp <8e7100d>
[149680.151750] next_to_watch <d9>
[149680.151750] jiffies <8e716c3>
[149680.151750] next_to_watch.status <1>
[149680.153751] e1000: eth1: e1000_clean_tx_irq: Detected Tx Unit Hang
[149680.153751] Tx Queue <0>
[149680.153751] TDH <aa>
[149680.153751] TDT <d2>
[149680.153751] next_to_use <d2>
[149680.153751] next_to_clean <2d>
[149680.153751] buffer_info[next_to_clean]
[149680.153751] time_stamp <8e710db>
[149680.153751] next_to_watch <2d>
[149680.153751] jiffies <8e716c5>
[149680.153751] next_to_watch.status <1>
[149702.565549] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149702.565549] Tx Queue <0>
[149702.565549] TDH <3c>
[149702.565549] TDT <3c>
[149702.565549] next_to_use <3c>
[149702.565549] next_to_clean <91>
[149702.565549] buffer_info[next_to_clean]
[149702.565549] time_stamp <8e7676e>
[149702.565549] next_to_watch <91>
[149702.565549] jiffies <8e76e48>
[149702.565549] next_to_watch.status <1>
[149708.020581] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149708.020581] Tx Queue <0>
[149708.020581] TDH <4c>
[149708.020581] TDT <4c>
[149708.020581] next_to_use <4c>
[149708.020581] next_to_clean <a1>
[149708.020581] buffer_info[next_to_clean]
[149708.020581] time_stamp <8e77cc3>
[149708.020581] next_to_watch <a1>
[149708.020581] jiffies <8e78394>
[149708.020581] next_to_watch.status <1>
[149713.864829] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149713.864833] Tx Queue <0>
[149713.864835] TDH <b0>
[149713.864836] TDT <b0>
[149713.864837] next_to_use <b0>
[149713.864839] next_to_clean <5>
[149713.864840] buffer_info[next_to_clean]
[149713.864841] time_stamp <8e7937b>
[149713.864842] next_to_watch <5>
[149713.864844] jiffies <8e79a64>
[149713.864845] next_to_watch.status <1>
[149759.710721] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149759.710726] Tx Queue <0>
[149759.710729] TDH <88>
[149759.710730] TDT <88>
[149759.710732] next_to_use <88>
[149759.710734] next_to_clean <dd>
[149759.710736] buffer_info[next_to_clean]
[149759.710738] time_stamp <8e8465c>
[149759.710740] next_to_watch <dd>
[149759.710742] jiffies <8e84d6f>
[149759.710744] next_to_watch.status <1>
[149759.712712] e1000: eth1: e1000_clean_tx_irq: Detected Tx Unit Hang
[149759.712715] Tx Queue <0>
[149759.712717] TDH <84>
[149759.712719] TDT <90>
[149759.712721] next_to_use <90>
[149759.712723] next_to_clean <e5>
[149759.712725] buffer_info[next_to_clean]
[149759.712726] time_stamp <8e84782>
[149759.712728] next_to_watch <e5>
[149759.712730] jiffies <8e84d71>
[149759.712732] next_to_watch.status <1>
[149768.334753] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149768.334757] Tx Queue <0>
[149768.334758] TDH <92>
[149768.334760] TDT <92>
[149768.334761] next_to_use <92>
[149768.334762] next_to_clean <e7>
[149768.334764] buffer_info[next_to_clean]
[149768.334765] time_stamp <8e86829>
[149768.334766] next_to_watch <e7>
[149768.334767] jiffies <8e86f1c>
[149768.334769] next_to_watch.status <1>
[149776.537825] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[149776.537825] Tx Queue <0>
[149776.537825] TDH <4e>
[149776.537825] TDT <4e>
[149776.537825] next_to_use <4e>
[149776.537825] next_to_clean <a3>
[149776.537825] buffer_info[next_to_clean]
[149776.537825] time_stamp <8e8882b>
[149776.537825] next_to_watch <a3>
[149776.537825] jiffies <8e88f21>
[149776.537825] next_to_watch.status <1>
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