On 28 March 2013 09:05, Lev Serebryakov <l...@freebsd.org> wrote:
> Yes: USB UMASS. It uses CAM too, and useful for very small systems,
> like 4MiB FLASH and 16MiB RAM (yes, whole system image, kernel and
> all, should be packed to 4MiB).
>
> Please note, Adrian speaks about CAM, not only CAM + ATA.
And I'm not at all saying we should keep the old ATA driver around.
I'm just pointing out a set of use cases that most FreeBSD developers
aren't involved with and I'd like to find a way to squeeze it more
efficiently into embedded platforms.
I've never had any noticable performance issues with CAM on my
embedded MIPS boards because it's typically pushing packets. It's just
the resultant binary size of the whole stack that's a problem.
adrian@freefall:~/public_html/ath$ cat AP121-nodebug.txt | grep scsi
text data bss dec hex filename
49372 10672 80 60124 eadc scsi_all.o
21200 2576 16 23792 5cf0 scsi_da.o
23288 1488 16 24792 60d8 scsi_xpt.o
adrian@freefall:~/public_html/ath$ cat AP121-nodebug.txt | grep cam
text data bss dec hex filename
3824 96 16 3936 f60 cam.o
13552 144 16 13712 3590 cam_periph.o
2344 144 0 2488 9b8 cam_queue.o
640 48 0 688 2b0 cam_sim.o
40684 752 192 41628 a29c cam_xpt.o
adrian@freefall:~/public_html/ath$ cat AP121-nodebug.txt | grep umass
text data bss dec hex filename
22592 1072 16 23680 5c80 umass.o
adrian@freefall:~/public_html/ath$ cat AP121-nodebug.txt | egrep
'(cam_|umass|scsi_)'
13552 144 16 13712 3590 cam_periph.o
2344 144 0 2488 9b8 cam_queue.o
640 48 0 688 2b0 cam_sim.o
40684 752 192 41628 a29c cam_xpt.o
49372 10672 80 60124 eadc scsi_all.o
21200 2576 16 23792 5cf0 scsi_da.o
23288 1488 16 24792 60d8 scsi_xpt.o
22592 1072 16 23680 5c80 umass.o
adrian@freefall:~/public_html/ath$ cat AP121-nodebug.txt | egrep
'(cam_|umass|scsi_)' | awk '{a+=$4} END {print a}'
190904
It doesn't seem like a lot, but it does add up..
Adrian
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