Re: [Dnsmasq-discuss] Estimation of TFTP Server Load Capabilities
On 24/07/14 04:13, Linux Luser wrote: I have a project where I use dnsmasq for netboot installs. Currently, there can be an unlimited number of installs happened at once. At what point (number of TFTP transfers happening in parallel) should I be concerned that I'm overtaxing dnsmasq's TFTP capabilities? Does dnsmasq use threads or multiprocessing for TFTP transfers? In my experience, the limit is unlikely to be dnsmasq, as long as it's not running on a very slow CPU. The problem is that TFTP is a very dumb protocol, and it really doesn't handle packet loss well. Nor does it rate limit well. This means that the normal cause of collapse (ie hosts never complete netboot) is network overload, causing packet loss, causing TFTP sessions to stall. If you have a fast network, it may all be fine, if you don't then changing the TFTP server probably won't help, you need to limit the number of simultaneous transactions. Cheers, Simon. ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] Estimation of TFTP Server Load Capabilities
One option here is to use iPXE ( http://www.ipxe.org/ ) to grab the netboot files via HTTP (or some other protocol) instead of relying on TFTP. There's some extra configuration work here, but serving up the 365KB iPXE image to clients via TFTP is a lot less work then serving up the entire kernel/initrd package. On 7/23/2014 11:13 PM, Linux Luser wrote: I have a project where I use dnsmasq for netboot installs. Currently, there can be an unlimited number of installs happened at once. At what point (number of TFTP transfers happening in parallel) should I be concerned that I'm overtaxing dnsmasq's TFTP capabilities? Does dnsmasq use threads or multiprocessing for TFTP transfers? Thanks. ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] Estimation of TFTP Server Load Capabilities
Thanks guys. That gives me some good things to think about and prepare for. On Jul 31, 2014 12:33 PM, Brian Rak b...@gameservers.com wrote: One option here is to use iPXE ( http://www.ipxe.org/ ) to grab the netboot files via HTTP (or some other protocol) instead of relying on TFTP. There's some extra configuration work here, but serving up the 365KB iPXE image to clients via TFTP is a lot less work then serving up the entire kernel/initrd package. On 7/23/2014 11:13 PM, Linux Luser wrote: I have a project where I use dnsmasq for netboot installs. Currently, there can be an unlimited number of installs happened at once. At what point (number of TFTP transfers happening in parallel) should I be concerned that I'm overtaxing dnsmasq's TFTP capabilities? Does dnsmasq use threads or multiprocessing for TFTP transfers? Thanks. ___ Dnsmasq-discuss mailing listdnsmasq-disc...@lists.thekelleys.org.ukhttp://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
[Dnsmasq-discuss] Estimation of TFTP Server Load Capabilities
I have a project where I use dnsmasq for netboot installs. Currently, there can be an unlimited number of installs happened at once. At what point (number of TFTP transfers happening in parallel) should I be concerned that I'm overtaxing dnsmasq's TFTP capabilities? Does dnsmasq use threads or multiprocessing for TFTP transfers? Thanks. ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
