Messages in this thread | | | Date | Tue, 09 Nov 2004 10:35:37 -0700 | From | "Jeff V. Merkey" <> | Subject | 2.6.9 RCU breakage in dev_queue_xmit |
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Running dual gigabit interfaces at 196 MB/S (megabytes/second) on receive, 12 CLK interacket gap time, 1500 bytes payload at 65000 packets per second per gigabit interface, and retransmitting received packets at 130 MB/S out of a third gigabit interface with skb, RCU locks in dev_queue_xmit breaks and enters the following state:
Nov 8 15:38:08 ds kernel: Badness in local_bh_enable at kernel/softirq.c:141 Nov 8 15:38:08 ds kernel: [<40107d1e>] dump_stack+0x1e/0x30 Nov 8 15:38:08 ds kernel: [<401218b0>] local_bh_enable+0x70/0x80 Nov 8 15:38:08 ds kernel: [<402c5bbb>] dev_queue_xmit+0x11b/0x250 Nov 8 15:38:08 ds kernel: [<f8981cb7>] xmit_skb+0x17/0x20 [dsfs] Nov 8 15:38:08 ds kernel: [<f8981f8e>] xmit_packet+0x2e/0x80 [dsfs] Nov 8 15:38:08 ds kernel: [<f89820eb>] regen_data+0x10b/0x290 [dsfs] Nov 8 15:38:08 ds kernel: [<401052c5>] kernel_thread_helper+0x5/0x10 Nov 8 15:38:08 ds kernel: Badness in local_bh_enable at kernel/softirq.c:141 Nov 8 15:38:08 ds kernel: [<40107d1e>] dump_stack+0x1e/0x30 Nov 8 15:38:08 ds kernel: [<401218b0>] local_bh_enable+0x70/0x80 Nov 8 15:38:08 ds kernel: [<402c5bbb>] dev_queue_xmit+0x11b/0x250 Nov 8 15:38:08 ds kernel: [<f8981cb7>] xmit_skb+0x17/0x20 [dsfs] Nov 8 15:38:08 ds kernel: [<f8981f8e>] xmit_packet+0x2e/0x80 [dsfs] Nov 8 15:38:08 ds kernel: [<f89820eb>] regen_data+0x10b/0x290 [dsfs] Nov 8 15:38:08 ds kernel: [<401052c5>] kernel_thread_helper+0x5/0x10
And before any of you guys whine about "give me a test case" I just did. Device driver is e1000 in the 2.6.9 kernel tree. System is a Xeon based system at 3 Ghz single processor with 4 GB of ram and a 3GB/1GB kernel/user split address space.
Jeff
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