| To: | Stewart Smith <stewart@xxxxxxxxx> |
|---|---|
| Subject: | Re: [PATCH 2/9]: Reduce Log I/O latency |
| From: | Andi Kleen <andi@xxxxxxxxxxxxxx> |
| Date: | Thu, 22 Nov 2007 13:06:11 +0100 |
| Cc: | David Chinner <dgc@xxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>, lkml <linux-kernel@xxxxxxxxxxxxxxx> |
| In-reply-to: | <1195702123.8369.78.camel@xxxxxxxxxxxxxxxxxxxxx> |
| References: | <20071122003339.GH114266761__34694.2978365861$1195691722$gmane$org@xxxxxxx> <p73oddnhzoq.fsf@xxxxxxxxxxxxxx> <20071122011214.GR114266761@xxxxxxx> <1195702123.8369.78.camel@xxxxxxxxxxxxxxxxxxxxx> |
| Sender: | xfs-bounce@xxxxxxxxxxx |
| User-agent: | Mutt/1.4.2.1i |
> FWIW from a "real time" database POV this seems to make sense to me... > in fact, we probably rely on filesystem metadata way too much > (historically it's just "worked".... although we do seem to get issues > on ext3). For that case you really would need priority inheritance: any metadata IO on behalf or blocking a process needs to use the process' block IO priority. David's change just fixes a limited set of cases, but breaks others. -Andi |
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