![]() | |||||||||||||
Messages in this thread |
On Fri, May 10 2002, Andrew Morton wrote: > > given there's still lots of idle-time, i'll file up lockmeter on here and > > see if theres any gremlins there. > > lockmeter will go off the dial. All those copies happen at > interrupt time, inside the global io_request_lock. It's horrid. Depends. For IDE, that is so. For SCSI, actually no io_request_lock is not held while doing the bounce copy. The write bounce copy never happens with io_request_lock held for either, the copy-back on reads only does if the caller holds io_request_lock while entering end_that_request_first() (or its own replacement, __scsi_end_request() for instance). The read copy-back is nasty for most users regardless of io_request_lock status, because it happens with interrupts disabled. > Try it with the block-highmem patch: > http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.19pre1aa1/00_block-highmem-all-18b-4.gz That's good advise :-) -- Jens Axboe - 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/ | ||||||||||||
| Last update: 2005-03-22 13:26 [from the cache] ©2003-2008 | |||||||||||||