Date: Mon, 25 Jan 1999 21:07:15 -0500 (EST) From: Brian Feldman <green@unixhelp.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Sheldon Hearn <axl@iafrica.com>, Lee Cremeans <lee@st-lcremean.tidalwave.net>, current@FreeBSD.ORG Subject: Re: IDE DMA works, I'll be a... Message-ID: <Pine.BSF.4.05.9901252106160.12387-100000@janus.syracuse.net> In-Reply-To: <199901260135.RAA11762@apollo.backplane.com>
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On Mon, 25 Jan 1999, Matthew Dillon wrote:
> :> I would like to know if your transfer rate improves or not, and by
> :> how much.
> :>
> :> #if 0
> :> if (cnt.v_inactive_count / 3 > page_shortage) {
> :> maxlaunder = 0;
> :> launder_loop = 0;
> :> } else
> :> #endif
> :> {
> :> -Matt
> :
> :I'd rather use if (0 && cnt.v_inactive_count / 3 > page_shortage) {. I'm
> :trying it out now, here's the "before":
> :
> :IOZONE performance measurements:
> : 2972048 bytes/second for writing the file
> : 2962863 bytes/second for reading the file
> : Brian Feldman _ __ ___ ___ ___
>
> Welll... I went ahead and tested it on my diskless workstation,
> which actually has a DMA IDE drive connected to it at the moment
> for another test I'm running.
>
> I didn't see any change in performance. That doesn't meant that
> hasn't been a chance, just that it doesn't look like the one thing
> I thought might be causing it is causing it.
>
> Are you sure the problem isn't simply that your disk is getting
> a bit more full and causing the test to skip around more ( or move
> to more inner tracks, which have lower transfer rates), and
> thus appear to slow down a little ?
No, this REALLY isn't it. I have tons free on the test drive. iozone 100 on
a 64 mb system:
{"/home/green"}$ diff iozone.old iozone
15,16c15,16
< Writing the 100 Megabyte file, 'iozone.tmp'...37.320312 seconds
< Reading the file...37.710938 seconds
---
> Writing the 100 Megabyte file, 'iozone.tmp'...37.750000 seconds
> Reading the file...37.687500 seconds
19,20c19,20
< 2809665 bytes/second for writing the file
< 2780562 bytes/second for reading the file
---
> 2777684 bytes/second for writing the file
> 2782291 bytes/second for reading the file
>
> -Matt
>
> Before ( iozone 64 on a 48MB machine )
>
> IOZONE performance measurements:
> 7809031 bytes/second for writing the file
> 10324440 bytes/second for reading the file
>
> IOZONE performance measurements:
> 8388608 bytes/second for writing the file
> 10324440 bytes/second for reading the file
>
> After ( iozone 64 on a 48MB machine )
>
> IOZONE performance measurements:
> 8103711 bytes/second for writing the file
> 10336864 bytes/second for reading the file
>
> IOZONE performance measurements:
> 8429768 bytes/second for writing the file
> 10324440 bytes/second for reading the file
>
> Matthew Dillon
> <dillon@backplane.com>
>
Brian Feldman _ __ ___ ___ ___
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