Arjan van de Ven <[EMAIL PROTECTED]> writes: > > You want to *use* the kernel pagecache as much as you can. You do so by > using mmap and such, and msync to force content to disk. That uses the
Last time I checked you couldn't mmap block devices. Has this changed now? Could be a problem for an iSCSI target. I remember there used to be a hack in 2.2 to map them to a pseudo fs to allow mmaping, but that's not very nice and would require another step by the administrator. Also using mmap would imply the server only works on 64bit systems, and may even there have uncomfortable limits. One issue is that the kernel currently doesn't garbage collect page tables, so e.g. when you map a 10TB volume this way and the user accesses it randomly you will eventually have quite a lot of page tables filling up your RAM. And those will not go away. My overall feeling is that mmap is not a good idea for this. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
