Subject: Re: FreeBSD Bus DMA
To: None <>
From: Justin T. Gibbs <>
List: tech-kern
Date: 06/11/1998 22:55:56
>"Justin T. Gibbs" writes:
>> I believe I have made a compelling case, along with real world numbers
>> comparing the NetBSD and FreeBSD implementations, for why allowing
>> deferred allocations is a win.
>What numbers? you've never given a single benchmark.

You must have come into this discussion late.  My first complete post
outlining the changes I made included two concreate examples with numbers
although I readily admit I botched the second example and corrected it

>> I have also given concreate numbers showing the space savings
>> possible for implementations that don't need to keep dm_segs like
>> data in the bus_dmamap_t object.
>No you haven't. You didn't give a single number. Jason gave a number,
>though -- he showed how this might save as much as 5000 bytes in total
>on my machine, worst case. You will pardon me for being less than

See my response to Jason.