From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Mark Lord <liml@rtr.ca>, Tejun Heo <htejun@gmail.com>,
linux-ide@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: Polling (was Re: [PATCHSET 2/2] implement PMP support, take 6)
Date: Mon, 01 Oct 2007 08:28:18 -0400 [thread overview]
Message-ID: <4700E7E2.4040208@garzik.org> (raw)
In-Reply-To: <20070929215623.030abd66@the-village.bc.nu>
Alan Cox wrote:
> ty today, with 3+ month kernel release cycles (ugh!!).
>> I'm very much interested in hearing suggestions and comments.
>
> I think PMP should go in for 2.6.24 and then get revised over time to not
> poll and to go via qc_issue. Which seems to be the consensus of everyone
> but you on this one.
It's not an "over time" issue. SAS drivers that will be ready for
2.6.24 (broadsas, mvsas) have both been coded to support PMP
transparently -- but the current libata PMP code requires that PMP
support in SAS be TURNED OFF, because it is fundamentally incompatible
by its design.
This is an issue that has been present and known for many, many months
-- as long as drivers/scsi/libsas/sas_ata.c has been in the tree.
The more we walk down the polling path, the more incompatible we become
with SATA-capable controllers that are in users' hands today.
Jeff
next prev parent reply other threads:[~2007-10-01 12:28 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-23 4:19 [PATCHSET 2/2] implement PMP support, take 6 Tejun Heo
2007-09-23 4:19 ` [PATCH 01/10] libata-pmp: update ata_eh_reset() for PMP Tejun Heo
2007-09-23 4:19 ` [PATCH 03/10] libata-pmp: hook PMP support and enable it Tejun Heo
2007-09-23 4:19 ` [PATCH 07/10] sata_sil24: implement PORT_RST Tejun Heo
2007-09-23 4:19 ` [PATCH 08/10] ahci: implement PMP support Tejun Heo
2007-09-23 4:19 ` [PATCH 02/10] libata-pmp: implement Port Multiplier support Tejun Heo
2007-09-23 4:19 ` [PATCH 04/10] libata-pmp: extend ACPI support to cover PMP Tejun Heo
2007-09-23 4:19 ` [PATCH 06/10] sata_sil24: implement PMP support Tejun Heo
2007-09-23 4:19 ` [PATCH 05/10] libata-pmp: implement qc_defer for command switching " Tejun Heo
2007-09-23 4:19 ` [PATCH 10/10] ahci: implement AHCI_HFLAG_NO_PMP Tejun Heo
2007-09-23 4:19 ` [PATCH 09/10] ahci: move host flags over to pi.private_data Tejun Heo
2007-09-26 2:09 ` Polling (was Re: [PATCHSET 2/2] implement PMP support, take 6) Jeff Garzik
2007-09-26 2:12 ` Jeff Garzik
2007-09-26 8:41 ` Tejun Heo
2007-09-28 12:10 ` Tejun Heo
2007-09-28 13:54 ` Jeff Garzik
2007-09-28 14:18 ` Tejun Heo
2007-09-28 14:57 ` Alan Cox
2007-09-28 15:20 ` Jeff Garzik
2007-09-28 15:43 ` Alan Cox
2007-09-28 15:40 ` Jeff Garzik
2007-09-28 20:00 ` Mark Lord
2007-09-29 1:49 ` Jeff Garzik
2007-09-29 3:29 ` Jeff Garzik
2007-09-29 4:58 ` Andrew Morton
2007-09-29 5:09 ` Jeff Garzik
2007-09-29 16:51 ` Greg Freemyer
2007-09-29 20:56 ` Alan Cox
2007-10-01 12:28 ` Jeff Garzik [this message]
2007-09-28 15:22 ` Jeff Garzik
2007-09-28 16:48 ` Tejun Heo
2007-09-28 20:02 ` Mark Lord
2007-09-28 20:25 ` Bartlomiej Zolnierkiewicz
2007-09-28 21:03 ` Alan Cox
2007-09-29 1:43 ` Jeff Garzik
2007-09-29 5:24 ` Tejun Heo
2007-10-01 13:31 ` Jeff Garzik
2007-10-02 0:11 ` Tejun Heo
2007-10-02 14:25 ` Alan Cox
2007-10-02 14:30 ` Jeff Garzik
2007-09-29 12:32 ` Mark Lord
2007-10-01 12:38 ` Jeff Garzik
2007-10-02 0:12 ` Tejun Heo
2007-10-02 12:56 ` Jeff Garzik
2007-10-02 13:06 ` Mark Lord
2007-10-02 13:30 ` Jeff Garzik
2007-10-06 22:02 ` Tejun Heo
2007-10-09 2:09 ` Jeff Garzik
2007-10-09 6:54 ` Tejun Heo
2007-09-28 14:20 ` Mark Lord
2007-09-28 15:36 ` Jeff Garzik
2007-09-28 15:55 ` Alan Cox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4700E7E2.4040208@garzik.org \
--to=jeff@garzik.org \
--cc=akpm@linux-foundation.org \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=htejun@gmail.com \
--cc=liml@rtr.ca \
--cc=linux-ide@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.