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Re: [Qemu-devel] [RFC PATCH RDMA support v4: 08/10] introduce QEMUFileRD


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC PATCH RDMA support v4: 08/10] introduce QEMUFileRDMA
Date: Tue, 19 Mar 2013 19:40:55 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130219 Thunderbird/17.0.3

Il 19/03/2013 19:27, Michael R. Hines ha scritto:
>>>
>> That however gives me an idea...  Instead of the full drain at the end
>> of an iteration, does it make sense to do a "partial" drain at every
>> chunk full, so that you don't have > N bytes pending and the downtime is
>> correspondingly limited?
> 
> 
> Sure, you could do that, but it seems overly complex just to avoid
> a single flush() call at the end of each iteration, right?

Would it really be that complex?  Not having an extra QEMUFile op
perhaps balances that complexity (and the complexity remains hidden in
rdma.c, which is an advantage).

You could alternatively drain every N megabytes sent, or something like
that.  But a partial drain would help obeying the maximum downtime
limitations.

Paolo



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