| To: | Jason Newton <nevion@xxxxxxxxx> |
|---|---|
| Subject: | Re: realtime section bugs still around |
| From: | Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> |
| Date: | Tue, 31 Jul 2012 18:46:25 -0500 |
| Cc: | Dave Chinner <david@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx |
| In-reply-to: | <CAGou9MgMHbTPebFUDXdyLvrUr4T9wo-geNtaPUft9uUmOaju6Q@xxxxxxxxxxxxxx> |
| References: | <CAGou9MgezsS=2+SngGWBJv5Npsuqacx1VPJwvMuf0FS+XnXt8A@xxxxxxxxxxxxxx> <20120730030333.GE2877@dastard> <CAGou9MheeBWxajd65szNfDB2L+VVoZ7SypEdUKj7np3L0H8fHA@xxxxxxxxxxxxxx> <CAGou9MgMHbTPebFUDXdyLvrUr4T9wo-geNtaPUft9uUmOaju6Q@xxxxxxxxxxxxxx> |
| Reply-to: | stan@xxxxxxxxxxxxxxxxx |
| User-agent: | Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20120713 Thunderbird/14.0 |
On 7/31/2012 6:01 PM, Jason Newton wrote: > I'm still interested in finding out why streaming a few hundred MB to disk > has so much over head in comparison to the calculations I do in userspace, 1. md eats a lot of cycles at high data rates 2. ATA overhead 3. IRQ/MSI overhead 4. Etc. All these small bits add up to more than negligible CPU overhead at high data rates. -- Stan |
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