[Samba] Aplication slow after migration
Felipe Martinez Hermo
felipe at galicia.ugt.org
Wed Feb 6 09:19:49 GMT 2008
Sinisa Bandin escribió:
>
>
> Felipe Martinez Hermo wrote:
>>
>>>> OK, so we're apples to apples, so to speak; the servers are tuned
>>>> the same. I'll assume your disks are tuned from hdparm and up to
>>>> snuff, otherwise you wouldn't be tuning sockets ;). Did your old
>>>> server have samba settings for oplocks set?
>>>>
>>>>
>>>> --
>>>> Peace and Blessings,
>>>> -Scott.
>>>>
>>>> "Of course, that's just my opinion; I could be wrong"
>>>> -Dennis Miller
>>> Erm, sorry, I didn't catch that you had 2 .conf files there. I'm
>>> back to the drawing board. Sorry about that. Anyone else have any
>>> ideas?
>> Yes, that's whats shocking me. Apparently we're apples to apples.
>> Except for the kernel (new&slow 2.6.18-4-686 vs old&fast 2.6.8)
>>
>> I've sniffed both eth0 interfaces and I've got some more information.
>> When talking to the slow server, the client needs to send 76 "TCP
>> segment of a reassembled PDU" that are not sent when talking to the
>> old and fast server.
>>
>> How can I workaround this issue? Should I lower server's MTU? How much?
>>
>> Thank you
> Do you happen to have a Realtek 8169 based gigabit ethernet in new
> server?
>
> If you do, I had the same problem several times last year, and solved
> all of them by changing motherboards (all were integrated, and I like
> them to stay that way because I can achieve full gigabit speed with
> several concurent clients)
>
> Best regards,
> Sinisa Bandin
>
>
No, machines are out-of-the-box HP DL servers:
Ethernet controller: Broadcom Corporation NetXtreme BCM5705_2 Gigabit
Ethernet (rev 03)
I've made a spreadsheet with summarizing wireshark results and comparing
results for both servers. You can see it here:
http://spreadsheets.google.com/ccc?key=pnLL2fInqFq2YKuZIphtQdA
It's meaningful that fast server makes 406 Trans2 calls, while slow
server makes 616 calls to perform the same operation. The difference is
mainly in QUERY_PATH_INFO (200 vs 305) and FIND_FIRST2 (94 vs 199) calls.
Next try: change ethernet wire? :-?
--
==============================
Felipe Martínez Hermo
felipe at galicia.ugt.org
fmartinez at galicia.ugt.org
==============================
Servicios Informáticos
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