Arjan van de Ven wrote:
On Tue, 2005-03-01 at 19:22 +0900, FUJITA Tomonori wrote:
From: Arjan van de Ven <[EMAIL PROTECTED]>
Subject: [Iscsitarget-devel] Re: [ANNOUNCE] iSCSI enterprise target software
Date: Tue, 01 Mar 2005 10:46:03 +0100
fsync or msync() ? I would imagine the target mmaping it's backend in
userspace and using msync() to kick off IO. At which point it's not that
much different from the control you do of the pagecache from inside the
kernel...
Can we avoid calling mmap() and munmap() repeatedly with large disk?
my server has 512Gb address space with 2.6.9/2.6.10, and a lot more than
that with the 2.6.11 kernel (4 level page tables rock). So the answer
would be yes.
(and on old servers without 64 bit, you indeed need to mmap/munmap
lazily to create a window, but I suspect that the 3 Gb of address space
you have there can be managed smart to minimize the number of unmaps if
you really try)
I don't know in detail what are you talking about (if whole disk must
fit address space) but please consider we're speaking about TBs (10-20
TB RAID is quite cheap nowadays with 400 GB SATA disks).
--
Best regards,
Libor Vanek
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