[syslinux] Problem with 90MB Initrd

[H. Peter Anvin]

76 MB would be less than the rollover threshold.

On September 30, 2015 3:45:23 AM PDT, Gene Cumm <gene.cumm at gmail.com> wrote:
>On Wed, Sep 23, 2015 at 4:58 PM, Gene Cumm <gene.cumm at gmail.com> wrote:
>> On Wed, Sep 23, 2015 at 4:24 PM, Patrick Masotta
><masottaus at yahoo.com> wrote:
>>>>>>
>>>
>>>  > BTW if you take a minute and read the first report
>>>  > https://communities.vmware.com/message/2536774
>>>  > You'll realize that VMWare TFTP "surprisingly" does not present
>slow TFTP transfers
>>>  > when they are driven by MS "bootmgfw.efi"; instead the problem is
>only shown when
>>>  > transfers are driven by syslinux.efi; At the moment, despite
>probably VMware not handling
>>>  > the net driver "polling" correctly, I started to wonder if "we"
>are really handling the EFI Event
>>>  > engine correctly when performing TFTP transfers within
>syslinux.efi
>>>  >
>>>
>>>  It might be a difference
>>>  between using the TFTP and using the UDP
>>>  interfaces, or somesuch.
>>>
>>>      -hpa
>>>  <<<
>>>
>>> Sure "bootmgfw.efi" is doing something better than we do about TFTP
>transfers.
>>> They:
>>> 1) do not rely on Service Binding Protocols then old EFI firmware
>PCs do not complain.
>>> 2) I think they do better when handling EFI Events and Timers.
>>>
>>> The key to see how they do what they do is this bootmgfw.efi
>function:
>>> TftppGetImageRegular
>>> but the task is time consuming; efi environment functions are only
>referenced by an index
>>> on a pointer table then knowing what functions they are really
>calling is not very easy
>>> to see.
>>
>> My current inclination is that there's a bug in Syslinux's TFTP+UDP
>> implementation.  If it's in the TFTP implementation, lpxelinux.0
>> should also exhibit issues with larger files (which I seem to recall
>> but can't be certain at the moment).
>
>lpxelinux.0 seems clear of this issue.  I did a transfer of ~76MB and
>didn't see any decay.  I'm thinking either UDP or memory allocation
>bug/misuse.

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