[Bug 200221] em0 watchdog timeout under load

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200221

Julien Cigar <jcigar at ulb.ac.be> changed:

           What    |Removed                     |Added
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                 CC|                            |jcigar at ulb.ac.be

--- Comment #20 from Julien Cigar <jcigar at ulb.ac.be> ---
Hello,

I'm running 10.2-RELEASE on a HP Proliant Microserver with the following
network interface:

em0 at pci0:2:0:0: class=0x020000 card=0xa01f8086 chip=0x10d38086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82574L Gigabit Network Connection'
    class      = network
    subclass   = ethernet

The machine run an NFS server and unless I mount the shared folder with a
rsize/wsize of 32768 I'm experiencing watchdog timeouts after a few minutes
under load (for ex streaming a movie):

Nov  7 23:25:26 mordor kernel: em0: Watchdog timeout Queue[0]-- resetting
Nov  7 23:25:26 mordor kernel: Interface is RUNNING and ACTIVE
Nov  7 23:25:26 mordor kernel: em0: TX Queue 0 ------
Nov  7 23:25:26 mordor kernel: em0: hw tdh = 508, hw tdt = 402
Nov  7 23:25:26 mordor kernel: em0: Tx Queue Status = -2147483648
Nov  7 23:25:26 mordor kernel: em0: TX descriptors avail = 93
Nov  7 23:25:26 mordor kernel: em0: Tx Descriptors avail failure = 0
Nov  7 23:25:26 mordor kernel: em0: RX Queue 0 ------
Nov  7 23:25:26 mordor kernel: em0: hw rdh = 206, hw rdt = 205
Nov  7 23:25:26 mordor kernel: em0: RX discarded packets = 0
Nov  7 23:25:26 mordor kernel: em0: RX Next to Check = 206
Nov  7 23:25:26 mordor kernel: em0: RX Next to Refresh = 205
Nov  7 23:25:26 mordor kernel: em0: link state changed to DOWN
Nov  7 23:25:30 mordor kernel: em0: link state changed to UP

... and I have to do an "hard" reboot

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