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UEFI iscsi boot windows 7 slowly
2019-04-12, 17:17 (This post was last modified: 2019-04-12 19:23 by ax2401.)
Post: #1
UEFI iscsi boot windows 7 slowly
Please forgive my poor english first.Sad

Test environment:

Server: windows server 2012 with iscsi target(wintarget) + tftp32 + latest ipxe.efi / snponly.efi + gpt system image (128GB, three partitons: ESP, MSR, and win7 OS volume)
Client : 1000M PCI-E NIC with UEFI network boot enabled ,local harddisk has removed.

After ClientPC boot into ipxe shell , I type
dhcp --> set keep-san 1 -> sanboot iscsi:10.10.10.253::::iqn.2019.com.test:gpt , then the clientPC begin load OS image, but very very slowly, it takes about 3 - 5 minutes before the windows boot animation logo appeared.

and at this time, I found the wintarget service in server side has crashed, once I restart the wintarget servive manually, it crashed soon(because ipxe will reconnect to target and retry the previous failed scsi cmd) , after crash -> restart for 10 - 20 times , the clientPC can successfully boot into windows desktop.

I tried snponly.efi , and tried another PC with diffrent NIC, the result always same. So I guess this is not a network or NIC driver problem, it maybe the ipxe send a wrong scsi command to iscsi target, and caused the target crash.

at last, I fetched the latest IPXE source ,and compiled with DEBUG=iscsi,scsi,efi_block:2, enable syslog, then I replace ipxe.efi in server side, and reboot the clientPC.

syslog I got after clientPC reboot:

...................
...................

<6>ipxe: EFIBLK 0x80 read LBA 0x00032800 to 0xbf5000+0x00002000
<6>ipxe: EFIBLK 0x80 read LBA 0x00072800 to 0xc04000+0x00004000
<6>ipxe: EFIBLK 0x80 read LBA 0x00672800 to 0xbf5000+0x00000400
<6>ipxe: EFIBLK 0x80 read LBA 0x0067280a to 0xbf5000+0x00000400
<6>ipxe: EFIBLK 0x80 read LBA 0x00072960 to 0xc08000+0x00004000
<6>ipxe: EFIBLK 0x80 read LBA 0x0067ab08 to 0xbf5000+0x00000400
<6>ipxe: EFIBLK 0x80 read LBA 0x0101c830 to 0xbf5000+0x00002000
<6>ipxe: EFIBLK 0x80 read LBA 0x004a5988 to 0x24c5000+0x014c2600
<6>ipxe: iSCSI 0xe9a3008 closed: Connection reset (http://ipxe.org/0f0a6095)
<6>ipxe: SCSI 0xe9a36e8 tag 18ae01e6 closed: Connection reset (http://ipxe.org/0f0a6095)
<6>ipxe: iSCSI 0xe99fb08 initiator iqn.2010-04.org.ipxe:2dfe4d56-efb6-00a3-efcf-7a4242c83c9f
<6>ipxe: iSCSI 0xe99fb08 target 10.10.10.253 iqn.2019.com.test:gpt
<6>ipxe: iSCSI 0xe99fb08 entering security negotiation
<6>ipxe: SCSI 0xe9a12e8 created for LUN 0000-0000-0000-0000
<6>ipxe: iSCSI 0xe99fb08 closed: Connection reset (http://ipxe.org/0f0a6095)
<6>ipxe: iSCSI 0xe99f908 initiator iqn.2010-04.org.ipxe:2dfe4d56-efb6-00a3-efcf-7a4242c83c9f
<6>ipxe: iSCSI 0xe99f908 target 10.10.10.253 iqn.2019.com.test:gpt
<6>ipxe: iSCSI 0xe99f908 entering security negotiation
<6>ipxe: SCSI 0xe99fb28 created for LUN 0000-0000-0000-0000
<6>ipxe: iSCSI 0xe99f908 closed: Connection reset (http://ipxe.org/0f0a6095)
......................................
......................................

once the log line " <6>ipxe: EFIBLK 0x80 read LBA 0x004a5988 to 0x24c5000+0x014c2600 " appears , the wintarget crashed .
from the source , the 0x014c2600 in the log means efi block read io size, I don't understand why there is an efi block io with read size set to 0x014c2600 bytes (21M). (usually the request size in one efi read io is 0x200 - 0x100000. (512B - 64K))

I simply add some code in the function efi_block_io_read (efi_block.c) :

if (len > 0x1000000)
{
return EFI_BAD_BUFFER_SIZE;
}

then the client can successfully boot with no errors in 30 - 40 seconds, and the target has not crash.
But this is not a good solution, I think we need to figure out the reason of why the len arg passed to efi_block_io_read is so large.



The GPT disk image in the target and the physical disk of the server are all ok, I checked with HDTUNE ,no errors or warnnings.

And I test in legacy bios with a MBR disk image, The boot slow problem and large size read request won't occurrs, only uefi.

I readed the UEFI spec , it doesn't mentioned the max request size limits of block_io_read.

maybe the bug is in efi block io protocol? or in wintarget? I'm not sure. (I haven't worked with uefi before today)

Any one can help? Thanks very much.
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2019-04-13, 06:05
Post: #2
RE: UEFI iscsi boot windows 7 slowly
This seems to be same or related to http://lists.ipxe.org/pipermail/ipxe-dev...06639.html

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2019-04-13, 12:13
Post: #3
RE: UEFI iscsi boot windows 7 slowly
(2019-04-13 06:05)NiKiZe Wrote:  This seems to be same or related to http://lists.ipxe.org/pipermail/ipxe-dev...06639.html

Yes, that's me.
I post here first,and a few hours later, I think it's better to post to devel-list. If conflict, please delete this post. I apologize for posting repeatedly.
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