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Re: Scatter-gather list constraints

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From: Andi Kleen <andi@...>
To: Alan Stern <stern@...>
Cc: Kernel development list <linux-kernel@...>, AntonioLin <antonio.lin@...>, David Vrabel <david.vrabel@...>
Subject: Re: Scatter-gather list constraints
Date: Saturday, June 21, 2008 - 7:00 pm

>> - Is it performance critical?

But only if there is a lot of 512 byte block IO? The only case I can think
of right now would be XFS log IO and perhaps some O_DIRECT/raw device
accesses.

Or how did you determine it is critical? Was there some important workload where
most of the requests had this form?

If it's only an relative oddball just copying is fine imho.

-Andi
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Messages in current thread:
Scatter-gather list constraints, Alan Stern, (Fri Jun 20, 4:30 pm)
Re: Scatter-gather list constraints, David Vrabel, (Mon Jun 23, 10:46 am)
Re: Scatter-gather list constraints, Alan Stern, (Mon Jun 23, 11:12 am)
Re: Scatter-gather list constraints, David Vrabel, (Mon Jun 23, 3:06 pm)
RE: Scatter-gather list constraints, Perez-Gonzalez, Inaky, (Wed Jun 25, 12:02 am)
RE: Scatter-gather list constraints, Alan Stern, (Wed Jun 25, 10:24 am)
RE: Scatter-gather list constraints, Perez-Gonzalez, Inaky, (Thu Jun 26, 12:43 pm)
RE: Scatter-gather list constraints, Alan Stern, (Thu Jun 26, 3:34 pm)
Re: Scatter-gather list constraints, Inaky Perez-Gonzalez, (Thu Jun 26, 6:39 pm)
Re: Scatter-gather list constraints, Alan Stern, (Mon Jun 23, 3:45 pm)
Re: Scatter-gather list constraints, Stefan Richter, (Mon Jun 23, 5:53 pm)
Re: Scatter-gather list constraints, Andi Kleen, (Sat Jun 21, 9:59 am)
Re: Scatter-gather list constraints, Alan Stern, (Sat Jun 21, 10:54 am)
Re: Scatter-gather list constraints, Andi Kleen, (Sat Jun 21, 11:21 am)
Re: Scatter-gather list constraints, Alan Stern, (Sat Jun 21, 5:50 pm)
Re: Scatter-gather list constraints, FUJITA Tomonori, (Tue Jun 24, 6:41 am)
Re: Scatter-gather list constraints, Alan Stern, (Tue Jun 24, 10:57 am)
Re: Scatter-gather list constraints, FUJITA Tomonori, (Tue Jun 24, 8:18 pm)
Re: Scatter-gather list constraints, Alan Stern, (Wed Jun 25, 10:23 am)
Re: Scatter-gather list constraints, FUJITA Tomonori, (Wed Jun 25, 10:06 pm)
Re: Scatter-gather list constraints, FUJITA Tomonori, (Thu Jun 26, 1:39 am)
Re: Scatter-gather list constraints, Jens Axboe, (Thu Jun 26, 2:35 am)
Re: Scatter-gather list constraints, Alan Stern, (Thu Jun 26, 10:18 am)
Re: Scatter-gather list constraints, FUJITA Tomonori, (Thu Jun 26, 2:58 am)
Re: Scatter-gather list constraints, Jens Axboe, (Thu Jun 26, 8:39 am)
Re: Scatter-gather list constraints, Boaz Harrosh, (Thu Jun 26, 11:16 am)
Re: Scatter-gather list constraints, Jens Axboe, (Thu Jun 26, 1:39 pm)
Re: Scatter-gather list constraints, Alan Stern, (Thu Jun 26, 11:12 am)
Re: Scatter-gather list constraints, Jens Axboe, (Thu Jun 26, 1:41 pm)
Re: Scatter-gather list constraints, Alan Stern, (Wed Aug 27, 5:32 pm)
Re: Scatter-gather list constraints, Andi Kleen, (Thu Jun 26, 8:54 am)
Re: Scatter-gather list constraints, Jens Axboe, (Thu Jun 26, 9:00 am)
Re: Scatter-gather list constraints, Andi Kleen, (Sat Jun 21, 7:00 pm)
Re: Scatter-gather list constraints, Alan Stern, (Sun Jun 22, 10:35 am)
Re: Scatter-gather list constraints, David Miller, (Fri Jun 20, 4:50 pm)