Messages in this thread |  | | Date | Mon, 06 Nov 2000 21:08:52 +0100 | From | Jorge Nerin <> | Subject | Re: ping -f kills ne2k (was:[patch] NE2000) |
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Paul Gortmaker wrote: > > > > > Well, I have tried it with 2.4.0-test10, both SMP and non-SMP, and the > > result is a little confusing. > > > > Under SMP a ping -s 50000 -f other_host takes down the network access > > with no messages (ne2k-pci), and no possibility of being restored > > without a reboot. > > > > Under UP the same command works ok, but after a while the dots stop for > > 30sec, then ping prints an 'E' and the dots continue. strace revealed > > this: > > Another suggestion - if you have your heart set on using ping > as your network stress tool, you may want to try using multiple > instances of MTU sized pings versus a single "ping -s 50000". > In this way you aren't involving any IP frag code and its associated > bean counting - giving us one less factor to consider. > > Oh, and since you get a silent failure, maybe you would be interested > in testing this patch I was (originally) saving for 2.5.x. -- It adds > watchdog transmit timeout functionality to 8390.c (which is used by > the ne2k-pci driver). Last time I updated it was a couple of months > ago, but nothing has changed since then. > > Paul. >
Tested with ping -f -s 1400 (1400 in order not to reach 1500) It took about half an hour and more than one million packets, but I finally took the net down, with 12 concurrent pings.
To eliminate factors I have deleted all the NAT rules wich gave messages about dropped packets, and unloaded all the iptables modules.
I have to make the test without the test check in sock_wait_for_wmem: if ((current->state & (TASK_INTERRUPTIBLE|TASK_UNINTERRUPTIBLE)) == 0) BUG();
Because as I said in a previous msg it gave me BUG()s very early in the tests, and I still had network access.
If someone has a better sugestion as a nic stress tool I can try it, but now I only have two ways of reaching this limits, ping -f of big packets, and sometimes (only 4 or 5) during a copy of a large file over NFS, but it's not a easy way to cause this.
-- Jorge Nerin <comandante@zaralinux.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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