Scott Lovenberg escribió:
On Feb 6, 2008 4:19 AM, Felipe Martinez Hermo <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
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
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
==============================
Servicios Informáticos
UGT Galicia
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
==============================
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Hrm, are you using SACKs or DSACKs or tcp_low_delay in
/proc/sys/net/somethingOrOther? They didn't change congestion control
default in your upstream kernel, did they? Should be "reno" by
default. Doing a netstat -a, do you have many packets queued in
either direction? This one is puzzling me.
--
Peace and Blessings,
-Scott.
Apparently everything is configured the same way in /proc/sys/net (both
sack & dsack = 1). Regarding the kernel, Old&fast kernel is 2.6.8 (no
/proc/sys/net/ipv4/tcp_congestion_control) while new&slow is
2.6.18-4-686 and congestion control is bic:
[EMAIL PROTECTED]:~$ cat /proc/sys/net/ipv4/tcp_congestion_control
bic
Should I try other congestion control algorithm?
I've made this rudimentary test, and old server is a little bit faster,
but I don't know if it is meaningful at all.
[EMAIL PROTECTED]:~$ ping -i 0.2 fast_server
--- fast_server ping statistics ---
2156 packets transmitted, 2156 received, 0% packet loss, time 431208ms
rtt min/avg/max/mdev = 0.135/0.171/0.245/0.018 ms
[EMAIL PROTECTED]:~$ ping -i 0.2 slow_server
--- slow_server ping statistics ---
2146 packets transmitted, 2146 received, 0% packet loss, time 429165ms
rtt min/avg/max/mdev = 0.152/0.179/0.333/0.021 ms
Regards,
--
==============================
Felipe Martínez Hermo
[EMAIL PROTECTED]
[EMAIL PROTECTED]
==============================
Servicios Informáticos
UGT Galicia
[EMAIL PROTECTED]
[EMAIL PROTECTED]
==============================
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