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Re: [Xen-devel] [PATCH][TOOLS] Reducing impact ofdomainsave/restore/dump
| To: | "Graham, Simon" <Simon.Graham@xxxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH][TOOLS] Reducing impact ofdomainsave/restore/dump on Dom0 |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Wed, 21 Feb 2007 15:10:21 +0000 |
| Delivery-date: | Wed, 21 Feb 2007 07:09:47 -0800 |
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| Thread-index: | AcdO73yfygbdSnxbR/2AnMRpBcbdNgAy2MewAXo9PloACVlAIAAAS21y |
| Thread-topic: | [Xen-devel] [PATCH][TOOLS] Reducing impact ofdomainsave/restore/dump on Dom0 |
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On 21/2/07 15:06, "Graham, Simon" <Simon.Graham@xxxxxxxxxxx> wrote: > 2. sync-then-advise is only done at the end of writing a file to ensure > that all > of the cached pages are discarded. Whilst writing the file, I only > fadvise > which triggers a write back and discards any clean pages up to the > specified offset. > This is indeed a performance thing -- fsyncing on every write makes > it very slow. Do you need the fsync at all? It's possible that the kernel will launder-then-discard the affected pages automatically, just from the fadvise() alone. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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