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Re: [SUGGESTION]: drop virtual merge accounting in I/O requests

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From: David Miller <davem@...>
To: <andi@...>
Cc: <mpatocka@...>, <sparclinux@...>, <linux-kernel@...>, <jens.axboe@...>
Subject: Re: [SUGGESTION]: drop virtual merge accounting in I/O requests
Date: Sunday, July 13, 2008 - 3:46 pm

From: Andi Kleen <andi@firstfloor.org>
Date: Sun, 13 Jul 2008 15:50:55 +0200


I know it matters a lot on sparc64 ESP scsi controllers.

You can only have one address/len pair DMA'ing at a time and you have
to service an interrupt to load in the the next DMA sg elements into
the chips registers.

Merging is essentially a must for performance on those cards.
--
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Messages in current thread:
[SUGGESTION]: drop virtual merge accounting in I/O requests, Mikulas Patocka, (Thu Jul 10, 5:56 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Andi Kleen, (Sat Jul 12, 8:30 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Sun Jul 13, 9:34 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Andi Kleen, (Sun Jul 13, 9:50 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Sun Jul 13, 3:46 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Andi Kleen, (Sun Jul 13, 4:13 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Sun Jul 13, 8:41 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., FUJITA Tomonori, (Sun Jul 13, 10:19 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Sun Jul 13, 11:20 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., FUJITA Tomonori, (Mon Jul 14, 1:45 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Tue Jul 15, 11:10 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., FUJITA Tomonori, (Wed Jul 16, 12:38 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Mon Jul 14, 5:26 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., FUJITA Tomonori, (Mon Jul 14, 10:40 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Tue Jul 15, 8:09 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., FUJITA Tomonori, (Tue Jul 15, 8:19 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Andi Kleen, (Tue Jul 15, 8:15 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Tue Jul 15, 9:16 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Andi Kleen, (Tue Jul 15, 10:06 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Sun Jul 13, 7:53 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Sun Jul 13, 8:48 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Mon Jul 14, 8:16 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Mon Jul 14, 8:28 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Mon Jul 14, 10:03 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., FUJITA Tomonori, (Mon Jul 14, 10:40 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Mon Jul 14, 5:37 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Mon Jul 14, 7:16 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Mon Jul 14, 9:31 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Tue Jul 15, 6:32 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Tue Jul 15, 6:37 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Tue Jul 15, 6:59 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., FUJITA Tomonori, (Fri Jul 11, 2:20 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Fri Jul 11, 6:52 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., FUJITA Tomonori, (Fri Jul 11, 7:15 am)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., David Miller, (Fri Jul 11, 3:41 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Fri Jul 11, 4:22 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Julian Calaby, (Thu Jul 10, 6:59 pm)
Re: [SUGGESTION]: drop virtual merge accounting in I/O reque..., Mikulas Patocka, (Thu Jul 10, 7:57 pm)