Ingo Molnar wrote:
* David Miller <[email protected]> wrote:
From: Ingo Molnar <[email protected]>
Date: Mon, 15 Oct 2007 13:24:30 +0200
got this warning with Linus' latest -git tree:
WARNING: at net/core/dev.c:2161 net_rx_action()
[<80564db4>] net_rx_action+0xce/0x186
[<8011ba98>] __do_softirq+0x6c/0xcf
[<8011bb2d>] do_softirq+0x32/0x36
[<8011bcae>] irq_exit+0x35/0x40
[<80104fdb>] do_IRQ+0x5c/0x71
[<801048cd>] do_nmi+0x8f/0x238
[<801033a3>] common_interrupt+0x23/0x30
=======================
This is a driver bug, the work "budget" passed into a driver's
->poll() handler should never be exceeded. That's what this warning
assertion is checking.
What ethernet card is in your system and what driver is being used to
drive it?
it's forcedeth.
i've checked nv_napi_poll(), and i dont see how it could return larger
than 'limit' number of packets.
it could return packets == limit though:
pkts = nv_rx_process_optimized(dev, budget);
...
if (pkts < budget) {
/* re-enable receive interrupts */
spin_lock_irqsave(&np->lock, flags);
__netif_rx_complete(dev, napi);
...
return pkts;
FWIW, forcedeth has this funky disable_irq()-based locking mechanism
that is currently the subject of some kernel.org bugzillas. I would
also check and make sure that isn't perturbing your results (even though
it seems unrelated, based on what I read here). That might include
disabling MSI if it's enabled, and/or turning on spinlock debugging.
Jeff
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