Re: V2.4 policy router operates faster/better than V2.6

["Jeremy M. Guthrie" <jeremy.guthrie@berbee.com>]

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These stats are from the driver Jesse instrumented.
ethtool -S eth3 | egrep -v ": 0"
NIC statistics:
     rx_packets: 1130958533
     tx_packets: 5
     rx_bytes: 2373643298
     tx_bytes: 398
     rx_errors: 4388190
     rx_dropped: 1486253
     rx_fifo_errors: 2901937
     rx_missed_errors: 2901937
     rx_long_byte_count: 582194228258
     rx_csum_offload_good: 1040376597
     int_tx_desc: 4
     int_tx_queueempty: 5
     int_link_state: 1
     int_rx_desc_min_thresh: 20704
     int_rx_fifo_ovr: 1208
     int_rx_timer: 331925913
     int_rxcfg: 1
     rx_csum_offload_errors: 325045

I am seeing more times w/ his driver where I run at zero errors.  Of the last 
877 samples since I switched drivers, I see 231 samples w/ zero errors.

On Friday 14 January 2005 10:05 am, Robert Olsson wrote:
> Jeremy M. Guthrie writes:
>  > I ran a script overnight using the modified driver you had given me
>  > Robert. it is interesting that there is almost always errors in the
>  > interface even though we aren't getting dst-cache errors and running ~
>  > 40% free CPU now.  I am going to switch over to Jesse's driver to see if
>  > his instrumentation helps nail down where the problem is.
>  >
>  >
>  >      rx_packets: 2722676103
>  >      tx_packets: 5
>  >      rx_bytes: 1171335471
>  >      tx_bytes: 398
>  >      rx_errors: 8558366
>  >      tx_errors: 0
>  >      rx_dropped: 1951692
>
>  It might come from be periodic work from GC process correlate drops w.
> rtatat.
>
>  I think the GC process can be made more smooth but studies and
> experimentation is probably needed as GC process is quite complex. Maybe
> some looked into this already?
>  Also you reported less drops when you increased the size of the RX ring
> and I see higher system performance with smaller RX rings. Both statements
> may actually be true. Big rings size may buffer during periodic work as GC.
I am running w/ 2048 input buffers.  I am going to increase to 10K and try 
again.

>  Also I have an experimental patch so you route without the route hash as a
>  comparison. You have to be brave...
I am about 300 miles from the machine this week and next week though I might 
be able to try it this weekend while I am home.

>  BTW we had this thread going for week,
Pardon me for being a bit naive but I am not understanding this last comment.

-- 

--------------------------------------------------
Jeremy M. Guthrie        jeremy.guthrie@berbee.com
Senior Network Engineer        Phone: 608-298-1061
Berbee                           Fax: 608-288-3007
5520 Research Park Drive         NOC: 608-298-1102
Madison, WI 53711

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