netdev - Re: e1000 driver and samba

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Date:	Sat, 15 Sep 2007 12:07:06 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	James Chapman <jchapman@...alix.com>, L F <lfabio.linux@...il.com>
Cc:	"Kok, Auke" <auke-jan.h.kok@...el.com>, netdev@...r.kernel.org
Subject: Re: e1000 driver and samba

James Chapman wrote:
> Kok, Auke wrote:
>> L F wrote:
>>> On 9/14/07, Kok, Auke <auke-jan.h.kok@...el.com> wrote:
>>>> this slowness might have been masking the issue
>>> That is possible. However, it worked for upwards of twelve months
>>> without an error.
>>>
>>>> I have not yet seen other reports of this issue, and it would be 
>>>> interesting to
>>>> see if the stack or driver is seeing errors. Please post `ethtool -S 
>>>> eth0` after
>>>> the samba connection resets or fails.
>>> If you look for it on the Realtek cards, there had been sporadic
>>> issues up to late 2005. The solution posted universally was 'change
>>> card'.
>>>
>>> I include the content of ethtool -S as requested:
>>> beehive:~# ethtool -S eth4
>>> NIC statistics:
>>>      rx_packets: 43538709
>>>      tx_packets: 68726231
>>>      rx_bytes: 34124849453
>>>      tx_bytes: 74817483835
>>>      rx_broadcast: 20891
>>>      tx_broadcast: 8941
>>>      rx_multicast: 459
>>>      tx_multicast: 0
>>>      rx_errors: 0
>>>      tx_errors: 0
>>>      tx_dropped: 0
>>>      multicast: 459
>>>      collisions: 0
>>>      rx_length_errors: 0
>>>      rx_over_errors: 0
>>>      rx_crc_errors: 0
>>>      rx_frame_errors: 0
>>>      rx_no_buffer_count: 0
>>>      rx_missed_errors: 0
>>>      tx_aborted_errors: 0
>>>      tx_carrier_errors: 0
>>>      tx_fifo_errors: 0
>>>      tx_heartbeat_errors: 0
>>>      tx_window_errors: 0
>>>      tx_abort_late_coll: 0
>>>      tx_deferred_ok: 486

this one I wonder about, and might cause delays, I'll have to look up what it 
exactly could implicate though.

>>>      tx_single_coll_ok: 0
>>>      tx_multi_coll_ok: 0
>>>      tx_timeout_count: 0
>>>      tx_restart_queue: 0
>>>      rx_long_length_errors: 0
>>>      rx_short_length_errors: 0
>>>      rx_align_errors: 0
>>>      tx_tcp_seg_good: 0
>>>      tx_tcp_seg_failed: 0
>>>      rx_flow_control_xon: 488
>>>      rx_flow_control_xoff: 488
>>>      tx_flow_control_xon: 0
>>>      tx_flow_control_xoff: 0
>>>      rx_long_byte_count: 34124849453
> 
> Are these long frames expected in your network? What is the MTU of the 
> transmitting clients? Perhaps this might explain why reads work (because 
> data is coming from the Linux box so the packets have smaller MTU) while 
> writes cause delays or packet loss because the clients are sending long 
> frames which are getting fragmented?

those are not "long frames" but the number of bytes the hardware counted in its 
"long" data type based byte counter.

Auke
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