[Xen-ia64-devel] [PATCH] Add netfornt tx_queue_len

[Tomonari Horikoshi <t.horikoshi@xxxxxxxxxxxxxx>]

Thank you for your comment. ( -> Isaku Yamahata)

Isaku Yamahata wrote:----------------------
Sent:    Tue, 23 Jan 2007 22:29:47 +0900
Subject: Re: [Xen-ia64-devel] [PATCH] Add netfornt tx_queue_len

> 
> The patch modifis common-code, not ia64 specific.
> You should send it to xen-devel with Cc to xen-ia64-devel.
> 


----------------------------------------------

Hi all.

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. 

--------------------

# ./netperf -t UDP_STREAM -H 10.34.179.101 -l 3 -- -m 10 -M 10

netperf[2474]: bugcheck! 0 [1]
Modules linked in:

Pid: 2474, CPU 0, comm:              netperf
psr : 00001010081a2010 ifs : 8000000000000b9b ip  : [<a0000001006c9ce0>]    Not 
tainted
ip is at network_start_xmit+0xa00/0xe40
unat: 0000000000000000 pfs : 8000000000000b9b rsc : 000000000000000b
rnat: 0000000000000000 bsps: 0000000000000000 pr  : 0104682415669999
ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70033f
csd : 0000000000000000 ssd : 0000000000000000


--------------------

Best regards,
Tomonari Horikoshi

Attachment: tx-queue-len-support.patch
Description: Binary data

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