From: Libor Vanek <lvanek@terra.cz>
To: Arjan van de Ven <arjan@infradead.org>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
linux-scsi@vger.kernel.org,
iscsitarget-devel@lists.sourceforge.net
Subject: Re: [Iscsitarget-devel] Re: [ANNOUNCE] iSCSI enterprise target software
Date: Tue, 01 Mar 2005 11:48:22 +0100 [thread overview]
Message-ID: <42244876.9000204@terra.cz> (raw)
In-Reply-To: <1109673220.6293.78.camel@laptopd505.fenrus.org>
Arjan van de Ven wrote:
>On Tue, 2005-03-01 at 19:22 +0900, FUJITA Tomonori wrote:
>
>
>>From: Arjan van de Ven <arjan@infradead.org>
>>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
next prev parent reply other threads:[~2005-03-01 10:48 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-01 7:19 [ANNOUNCE] iSCSI enterprise target software FUJITA Tomonori
2005-03-01 8:40 ` Arjan van de Ven
2005-03-01 9:35 ` FUJITA Tomonori
2005-03-01 9:46 ` Arjan van de Ven
2005-03-01 10:22 ` [Iscsitarget-devel] " FUJITA Tomonori
2005-03-01 10:33 ` Arjan van de Ven
2005-03-01 10:46 ` Arjan van de Ven
2005-03-01 11:23 ` FUJITA Tomonori
2005-03-01 10:48 ` Libor Vanek [this message]
2005-03-01 10:51 ` Arjan van de Ven
2005-03-01 18:24 ` Bryan Henderson
2005-03-01 18:37 ` Arjan van de Ven
2005-03-01 18:48 ` Ming Zhang
2005-03-01 19:01 ` Jeff Garzik
2005-03-01 19:14 ` Ming Zhang
2005-03-01 21:04 ` Bryan Henderson
2005-03-01 21:15 ` Ming Zhang
2005-03-02 18:20 ` Bryan Henderson
2005-03-02 19:34 ` Ming Zhang
2005-03-01 21:16 ` Arjan van de Ven
2005-03-02 18:27 ` Bryan Henderson
2005-03-02 3:30 ` FUJITA Tomonori
2005-03-01 20:38 ` Andi Kleen
2005-03-01 20:49 ` Ming Zhang
2005-03-01 22:19 ` Christoph Hellwig
2005-03-01 20:53 ` Bryan Henderson
2005-03-01 20:58 ` Arjan van de Ven
2005-03-02 10:47 ` Vladislav Bolkhovitin
2005-03-02 18:39 ` Bryan Henderson
2005-03-02 5:04 ` [Iscsitarget-devel] " FUJITA Tomonori
2005-03-02 5:21 ` Dmitry Yusupov
[not found] <20050301190140.97212.qmail@web30006.mail.mud.yahoo.com>
2005-03-01 19:29 ` Ming Zhang
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