Re: [Xen-devel] [PATCH] Add netfornt tx_queue_len

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

On Wed, Jan 24, 2007 at 01:37:55AM +0000, Tomonari Horikoshi wrote:
> 
> When I executed "netperf" by a short message of UDP, 
> PV domain and PV-on-HVM driver issued Call trace.
> 
> I think that GrantEntry was filled with a lot of messages processings.
> 
> This problem is generated in IA64 only.
> Probably, I think that I am the following problems. 
> 
>   In IA64
>     NET_TX_RING_SIZE 1024,  NR_GRANT_ENTRIES 2048
>   In x86
>     NET_TX_RING_SIZE  256,  NR_GRANT_ENTRIES 2048
> 
> I corrected to check "number of unprocessing queue > tx_queue_len" before 
> Grant was filled.
> 
> However, my correction influences x86. 
> Please teach to me in that when there is a better improvement. 

Sorry, but this patch looks bogus.  The tx queue is maintained by
Linux and has nothing to do with the driver.  So limiting its length
based on internal state of the driver can't be right.

We need to find out what's really going wrong with the grant table
entries here.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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