On 21.09.2015 13:32, Patrick Masotta wrote:> > What do you observe? Does it transfer the file then the Linux kernel > > crashes? Does it spontaneously reboot before completing the > > operation? > The client is a VSphere VM Client. It displayes the IP Address and > then: > Loading Kernel..... ok > Loading initrd.bz2... > > This stalls for minutes and the client reboots afterwards. > <<< > > I have seen this before; Are you using VMware 12 ? > try changing the virtual driver. > I have reported a bug on certain VMware drivers that > mistakenly set TFTP blocksize to 1486 instead of 1468, > That leads to IP fragmentation and high chances of an aborted > TFTP transfer if the file is big. See here: > https://communities.vmware.com/message/2536960 > A Wireshark traffic capture will confirm if you are suffering > this VMware bug > > VMware is lately having some issues with TFTP transfers, > This is another reported bug that produces extremely > low speed TFTP transfers under EFI; this could also lead > to aborted transfers if the file is big. > https://communities.vmware.com/message/2536774 > > Best, > Patrick >Server is VMWare ESXi 5.5 Cheers -- Mathias Radtke, uib mail m.radtke at uib.de
>>>> > I have seen this before; Are you using VMware 12 ? > try changing the virtual driver. > I have reported a bug on certain VMware drivers that > mistakenly set TFTP blocksize to 1486 instead of 1468, > That leads to IP fragmentation and high chances of an aborted > TFTP transfer if the file is big. See here: > https://communities.vmware.com/message/2536960 > A Wireshark traffic capture will confirm if you are suffering > this VMware bug > > VMware is lately having some issues with TFTP transfers, > This is another reported bug that produces extremely > low speed TFTP transfers under EFI; this could also lead > to aborted transfers if the file is big. > https://communities.vmware.com/message/2536774 > > Best, > Patrick > Server is VMWare ESXi 5.5 Mathias Radtke, uib <<< Despite you are using the 5.5 I would take a traffic capture and see first hand what's really going on. Please also consider VMware ESXi and Workstations PXE roms/drivers are the same... Best, Patrick
On Mon, Sep 21, 2015 at 8:16 AM, Patrick Masotta <masottaus at yahoo.com> wrote:>>>> > > > > I have seen this before; Are you using VMware 12 ? > > try changing the virtual driver. > > I have reported a bug on certain VMware drivers that > > mistakenly set TFTP blocksize to 1486 instead of 1468, > > That leads to IP fragmentation and high chances of an aborted > > TFTP transfer if the file is big. See here: > > https://communities.vmware.com/message/2536960 > > A Wireshark traffic capture will confirm > if you are suffering > > this VMware bug > > > > VMware is lately having some issues with TFTP transfers, > > This is another reported bug that produces extremely > > low speed TFTP transfers under EFI; this could also lead > > to aborted transfers if > the file is big. > > https://communities.vmware.com/message/2536774 > > > > Best, > > Patrick > > > > Server is VMWare ESXi 5.5 > Mathias Radtke, uib > > <<< > > Despite you are using the 5.5 I would take a traffic capture > and see first hand what's really going on. > Please also consider VMware ESXi and Workstations PXE roms/drivers > are the same...Patrick, the pattern is quite recognizable. See also "[syslinux] EFI & PXE-booting: very slow TFTP performance on a VMWare test setup" http://www.syslinux.org/archives/2015-June/023634.html -- -Gene