Sanboot too slow

[CrystalPalace]

Hello,

I have a problem during the boot of an image of windows 7 from an iscsi target.
it lasts longer than two minutes, against 40 secondes with the local disk...

During startup, the iscsi is stopped for a moment and i can see "TCP Retransmission" with tcpdump(see below). After that, everything work fine...

I use the last ipxe from the git repository, all has been compiled on the same host.

tcpdump :

44487 7.124119 192.168.186.1 -> 192.168.186.22 TCP 66 3260→63830 [ACK] Seq=64411681 Ack=443841 Win=361 Len=0 TSval=111891447 TSecr=880913
44488 7.126793 192.168.186.1 -> 192.168.186.22 iSCSI 114 SCSI: Response LUN: 0x00 (Write(10)) (Good)
44489 7.126971 192.168.186.22 -> 192.168.186.1 TCP 66 63830→3260 [ACK] Seq=443841 Ack=64411729 Win=512 Len=0 TSval=880913 TSecr=111891447
44490 7.127016 192.168.186.22 -> 192.168.186.1 iSCSI 114 SCSI: Write(10) LUN: 0x00 (LBA: 0x002644bc, Len: 1)
44491 7.127064 192.168.186.1 -> 192.168.186.22 iSCSI 114 Ready To Transfer
44492 7.127217 192.168.186.22 -> 192.168.186.1 TCP 114 [TCP segment of a reassembled PDU]
44493 7.163899 192.168.186.1 -> 192.168.186.22 TCP 66 3260→63830 [ACK] Seq=64411777 Ack=443937 Win=361 Len=0 TSval=111891457 TSecr=880913
44494 7.164166 192.168.186.22 -> 192.168.186.1 iSCSI 578 SCSI: Data Out LUN: 0x00 (Write(10) Request Data)
44495 7.164193 192.168.186.1 -> 192.168.186.22 TCP 66 3260→63830 [ACK] Seq=64411777 Ack=444449 Win=369 Len=0 TSval=111891457 TSecr=880913
44496 7.234320 192.168.186.1 -> 192.168.186.22 iSCSI 114 SCSI: Response LUN: 0x00 (Write(10)) (Good)
44497 7.435896 192.168.186.1 -> 192.168.186.22 iSCSI 114 [TCP Retransmission] SCSI: Response LUN: 0x00 (Write(10)) (Good)
44498 7.639895 192.168.186.1 -> 192.168.186.22 iSCSI 114 [TCP Retransmission] SCSI: Response LUN: 0x00 (Write(10)) (Good)
44499 8.047899 192.168.186.1 -> 192.168.186.22 iSCSI 114 [TCP Retransmission] SCSI: Response LUN: 0x00 (Write(10)) (Good)
44500 8.863895 192.168.186.1 -> 192.168.186.22 iSCSI 114 [TCP Retransmission] SCSI: Response LUN: 0x00 (Write(10)) (Good)
44501 10.499898 192.168.186.1 -> 192.168.186.22 iSCSI 114 [TCP Retransmission] SCSI: Response LUN: 0x00 (Write(10)) (Good)
44502 18.487904 192.168.186.1 -> 192.168.186.22 iSCSI 102 Logout Response
44503 20.311904 192.168.186.1 -> 192.168.186.22 iSCSI 114 [TCP Retransmission] SCSI: Response LUN: 0x00 (Write(10)) (Good)
44504 24.055915 Intel_6e:45:a6 -> Broadcast AoE 32 Query Config Information Request
44505 33.399904 192.168.186.1 -> 192.168.186.22 iSCSI 114 [TCP Retransmission] SCSI: Response LUN: 0x00 (Write(10)) (Good)
44506 38.407895 Intel_6e:45:a6 -> HonHaiPr_87:51:e7 ARP 42 Who has 192.168.186.22? Tell 192.168.186.1
44507 39.407892 Intel_6e:45:a6 -> HonHaiPr_87:51:e7 ARP 42 Who has 192.168.186.22? Tell 192.168.186.1
44508 40.407890 Intel_6e:45:a6 -> HonHaiPr_87:51:e7 ARP 42 Who has 192.168.186.22? Tell 192.168.186.1
44509 59.575914 Intel_6e:45:a6 -> Broadcast ARP 42 Who has 192.168.186.22? Tell 192.168.186.1
44510 60.575904 Intel_6e:45:a6 -> Broadcast ARP 42 Who has 192.168.186.22? Tell 192.168.186.1
44511 61.575898 Intel_6e:45:a6 -> Broadcast ARP 42 Who has 192.168.186.22? Tell 192.168.186.1
44512 84.215923 Intel_6e:45:a6 -> Broadcast AoE 32 Query Config Information Request
44513 85.751900 Intel_6e:45:a6 -> Broadcast ARP 42 Who has 192.168.186.22? Tell 192.168.186.1
44514 86.751894 Intel_6e:45:a6 -> Broadcast ARP 42 Who has 192.168.186.22? Tell 192.168.186.1
44515 87.751893 Intel_6e:45:a6 -> Broadcast ARP 42 Who has 192.168.186.22? Tell 192.168.186.1
44516 101.631688 HonHaiPr_87:51:e7 -> Broadcast ARP 60 Who has 192.168.186.1? Tell 192.168.186.22
44517 101.631717 Intel_6e:45:a6 -> HonHaiPr_87:51:e7 ARP 42 192.168.186.1 is at 00:0e:0c:6e:45:a6
44518 101.631823 192.168.186.22 -> 192.168.186.1 TCP 66 [TCP Port numbers reused] 49152→3260 [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
44519 101.631862 192.168.186.1 -> 192.168.186.22 TCP 66 [TCP Retransmission] 3260→49152 [SYN, ACK] Seq=3176460178 Ack=2129312667 Win=29200 Len=0 MSS=1460 SACK_PERM=1 WS=128
44520 101.631994 192.168.186.22 -> 192.168.186.1 TCP 60 49152→3260 [ACK] Seq=1 Ack=1 Win=65536 Len=0
44521 101.632177 192.168.186.22 -> 192.168.186.1 iSCSI 254 Login Command
44522 101.632206 192.168.186.1 -> 192.168.186.22 TCP 54 3260→49152 [ACK] Seq=3176460179 Ack=2129312867 Win=30336 Len=0
44523 101.632378 192.168.186.1 -> 192.168.186.22 iSCSI 142 [TCP Retransmission] Login Response (Success)
44524 101.632815 192.168.186.22 -> 192.168.186.1 iSCSI 402 Login Command
44525 101.632944 192.168.186.1 -> 192.168.186.22 iSCSI 358 [TCP Retransmission] Login Response (Success)
44526 101.645772 192.168.186.22 -> 192.168.186.1 iSCSI 102 SCSI: Report LUNs LUN: 0x00

Here is the command use to launch the sanboot :

sleep 1
set keep-san 1
sanboot iscsi:192.168.186.1::::iqn.2015-03.xxxxx.xx:storage.smc


can someone help me to solve my probleme ? thanks