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Re: [Qemu-devel] [Qemu-block] [PATCH for-2.8? 0/3] block/curl: Drop TFTP

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH for-2.8? 0/3] block/curl: Drop TFTP "support"
Date: Mon, 7 Nov 2016 12:57:10 +0000
User-agent: Mutt/1.7.1 (2016-10-04)

On Wed, Nov 02, 2016 at 06:55:36PM +0100, Max Reitz wrote:
> See patch 3 for the reason why we have actually never supported TFTP at
> all (except for very small files (i.e. below 256 kB or so)).

I agree with dropping TFTP from the curl block driver but for the

TFTP is not good for large files anyway - performance is poor due to the
lock-step ACK protocol.  It is used for <256 KB files to chainload
Network Boot Programs (PXE) so the small file scenario is actually
realistic for TFTP.

In that use case it doesn't really make sense to use a block device in
QEMU though.  The guest would do the TFTP itself so I don't see a need
to offer the protocol in the curl block driver.


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