<html><body bgcolor="#FFFFFF"><div>Hello Jerry,</div><div><br></div><div>I can't speak to the anomaly you're seeing with iscsi, but you /may/ be able to get a significant improvement on boot times by using iPXE's AoE initiator instead, as AoE is a much lighter weight protocol. </div>
<div><br></div><div>The Etherboot wiki has some fairly comprehensive AoE setup guides if you'd like to try it out :)</div><div><br></div><div>Cheers,</div><div>Andrew Bobulsky<br><br>On May 22, 2011, at 9:53 PM, "jerrycheng-hinet" <<a href="mailto:jaspers.cheng@msa.hinet.net">jaspers.cheng@msa.hinet.net</a>> wrote:<br>
<br></div><div></div><blockquote type="cite"><div>
<div><font face="Arial">Hi, all,</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">I tried to compare windows xp booting time by using
Microsoft bootvis. </font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">For the first glance, ipxe always slower than local HDD
than about 5 seconds. The bootvis showed the disk init time of local HDD is
about 2.2 seconds, and iPXE is about 15.5 seconds.</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Than I tried to use wireshark to observe what happened in
iPXE's disk init time. From the following captured message, I found there has a
15 seconds gap that iSCSI connection seemed to get into trouble.<br>
<br>29408 15.646359 192.168.1.63 192.168.1.2 iSCSI SCSI:
Data Out LUN: 0x00 (Write(10) Request Data)
<br>29409 15.646374 192.168.1.2 192.168.1.63 TCP iscsi-target
> 28906 [ACK] Seq=18548589 Ack=86633 Win=18760 Len=0 TSV=624524
TSER=577920<br>29410 15.646818 192.168.1.2 192.168.1.63 iSCSI SCSI:
Response LUN: 0x00 (Write(10))
(Good)<br>29411 15.647008 192.168.1.63 192.168.1.2 TCP 28906
> iscsi-target [ACK] Seq=86633 Ack=18548637 Win=8192 Len=0 TSV=577920
TSER=624524<br>29412 17.443849 QuantaCo_9b:e4:69 Broadcast ARP Gratuitous
ARP for 192.168.1.63
(Request)<br>29413 18.018077 QuantaCo_9b:e4:69 Broadcast ARP Who
has 192.168.1.2? Tell
192.168.1.63<br>29414 18.018090 Giga-Byt_d6:86:bc QuantaCo_9b:e4:69 ARP 192.168.1.2
is at
1c:6f:65:d6:86:bc<br>29415 18.018191 192.168.1.63 192.168.1.2 TCP cap
> iscsi-target [SYN] Seq=0 Win=65535 Len=0 MSS=1460
SACK_PERM=1<br>29416 18.018212 192.168.1.2 192.168.1.63 TCP iscsi-target
> cap [ACK] Seq=1 Ack=2229090051 Win=65535
Len=0<br>29417 18.018318 192.168.1.63 192.168.1.2 TCP cap
> iscsi-target [RST] Seq=2229090051 Win=0
Len=0<br>29418 18.439915 QuantaCo_9b:e4:69 Broadcast ARP Gratuitous
ARP for 192.168.1.63
(Request)<br>29419 19.439930 QuantaCo_9b:e4:69 Broadcast ARP Gratuitous
ARP for 192.168.1.63
(Request)<br>29420 20.986835 192.168.1.63 192.168.1.2 TCP cap
> iscsi-target [SYN] Seq=0 Win=65535 Len=0 MSS=1460
SACK_PERM=1<br>29421 20.986862 192.168.1.2 192.168.1.63 TCP [TCP
Previous segment lost] iscsi-target > cap [SYN, ACK] Seq=590980907 Ack=1
Win=14600 Len=0 MSS=1460
SACK_PERM=1<br>29422 20.986966 192.168.1.63 192.168.1.2 TCP cap
> iscsi-target [ACK] Seq=1 Ack=590980908 Win=65535
Len=0<br>29423 20.987203 192.168.1.63 192.168.1.2 iSCSI Login
Command<br>29424 20.987222 192.168.1.2 192.168.1.63 TCP iscsi-target
> cap [ACK] Seq=590980908 Ack=197 Win=15544
Len=0<br>29422 20.986966 192.168.1.63 192.168.1.2 TCP cap
> iscsi-target [ACK] Seq=1 Ack=590980908 Win=65535
Len=0<br>29423 20.987203 192.168.1.63 192.168.1.2 iSCSI Login
Command<br>29424 20.987222 192.168.1.2 192.168.1.63 TCP iscsi-target
> cap [ACK] Seq=590980908 Ack=197 Win=15544
Len=0<br>29425 20.987376 192.168.1.2 192.168.1.63 iSCSI Login
Response
(Success)<br>29426 20.987715 192.168.1.63 192.168.1.2 iSCSI Login
Command<br>29427 20.987815 192.168.1.2 192.168.1.63 iSCSI Login
Response
(Success)<br>29428 21.190002 192.168.1.2 192.168.1.63 iSCSI [TCP
Retransmission] Login Response
(Success)<br>29429 21.190154 192.168.1.63 192.168.1.2 TCP cap
> iscsi-target [ACK] Seq=545 Ack=590981300 Win=65143
Len=0<br>29430 30.987718 192.168.1.63 192.168.1.2 iSCSI SCSI:
Report LUNs LUN: 0x00
<br>29431 30.987878 192.168.1.2 192.168.1.63 iSCSI SCSI:
Data In LUN: 0x00 (Report LUNs Response Data) SCSI: Response LUN: 0x00 (Report
LUNs)
(Good)<br>29432 30.988292 192.168.1.63 192.168.1.2 iSCSI SCSI:
Inquiry LUN: 0x00 </font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Could you give me some advise about what could be wrong?
Is it possible that iPXE can boot faster than local HDD? Thanks!</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Regards,<br>Jerry<br></font></div>
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