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Re: [Qemu-devel] [PATCH v2 4/4] libqos/ahci: Swap memread/write with buf

From: John Snow
Subject: Re: [Qemu-devel] [PATCH v2 4/4] libqos/ahci: Swap memread/write with bufread/write
Date: Tue, 05 May 2015 12:26:50 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

On 05/05/2015 12:19 PM, Paolo Bonzini wrote:
> On 05/05/2015 17:48, John Snow wrote:
>> I specifically left things that alter control flow using hex nibbles --
>> such as the FIS packets, PRD tables, and all other existing tests. I
>> only use the b64 encoding for raw data patterns, which don't really need
>> to be debugged. Either they match or they don't: any particular values
>> are uninteresting.
> To some extent: they may still be interesting for stuff like IDENTIFY.

You got me there.

>> Any future test can be switched to/from hex/b64 by just altering
>> "mem{read,write}()" to "buf{read,write}()" as desired. I specifically
>> opted not to alter *all* qtest IO for this very reason.
>> Does that help? :)
> Yes.  We could also switch unconditionally to b64, but keep hex in the
> qtest-log.

Hmm, there's a thought. Though b64 for a handful of bytes seems
definitely likely to be slower. I am comfortable having two
implementations at the moment.

(Mostly because I don't feel like testing what the threshold for which
strings should be sent with what method is. Too much effort for qtest.)

hex-always in the log is a good idea, though. I may do that.

>> If you're not opposed to the rest of this series, I will send a v2
>> including the hex batching optimization.
> This series is okay.  I just wanted some clarifications and ideas for
> future work.
> Paolo

Just trying to make you happy ;)


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