Messages in this thread | | | Subject | Re: A new ide warning message | From | Steve Lord <> | Date | 02 Aug 2002 08:50:55 -0500 |
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On Fri, 2002-08-02 at 07:41, Jens Axboe wrote: > > Yeah it's a request for data, what else could it be? That's the only > place where we call blk_rq_map_sg(). > > Stephen, please provoke with this patch applied. I hope it works, it's > untested :-) >
Consider it provoked, I added a trace to the submit_bio call in XFS as well, dumping sector number, bio length in bytes and number of vector elements submitted:
submit_bio(READ, sector 0x414870, len 65536 vec_len 16 submit_bio(READ, sector 0x4148f0, len 65536 vec_len 16 pcidma: build 2 segments, supplied 1/16, sectors 128/8 bio 0: phys 1, hw 16 segment 0: phys 69599232, size 4096 segment 1: phys 69603328, size 4096 segment 2: phys 69607424, size 4096 segment 3: phys 69611520, size 4096 segment 4: phys 69615616, size 4096 segment 5: phys 69619712, size 4096 segment 6: phys 69623808, size 4096 segment 7: phys 69627904, size 4096 segment 8: phys 69632000, size 4096 segment 9: phys 69636096, size 4096 segment 10: phys 69640192, size 4096 segment 11: phys 69644288, size 4096 segment 12: phys 69648384, size 4096 segment 13: phys 69652480, size 4096 segment 14: phys 69656576, size 4096 segment 15: phys 69660672, size 4096 pcidma: build 2 segments, supplied 1/16, sectors 128/8 bio 0: phys 1, hw 16 segment 0: phys 69664768, size 4096 segment 1: phys 69668864, size 4096 segment 2: phys 69672960, size 4096 segment 3: phys 69677056, size 4096 segment 4: phys 69681152, size 4096 segment 5: phys 69685248, size 4096 segment 6: phys 69689344, size 4096 segment 7: phys 69693440, size 4096 segment 8: phys 69697536, size 4096 segment 9: phys 69701632, size 4096 segment 10: phys 69705728, size 4096 segment 11: phys 69709824, size 4096 segment 12: phys 69713920, size 4096 segment 13: phys 69718016, size 4096 segment 14: phys 69722112, size 4096 segment 15: phys 69726208, size 4096
And so on.....
The bio size being used is based purely on the BIO_MAX_SECTORS constant, same code as ll_rw_kio. Looks like the direct I/O path uses similar math.
Steve
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Steve Lord voice: +1-651-683-3511 Principal Engineer, Filesystem Software email: lord@sgi.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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