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Re: [Xen-devel] [PATCH] Reduce overhead in find_domain_by_id() [0/2]
| To: | "Santos, Jose Renato G" <joserenato.santos@xxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] Reduce overhead in find_domain_by_id() [0/2] |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Wed, 06 Dec 2006 08:43:32 +0000 |
| Cc: | Yoshio Turner <yoshiotu@xxxxxxxxxx>, Jose Renato Santos <jsantos@xxxxxxxxxx>, G John Janakiraman <john@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Wed, 06 Dec 2006 00:43:43 -0800 |
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| Thread-topic: | [Xen-devel] [PATCH] Reduce overhead in find_domain_by_id() [0/2] |
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On 6/12/06 1:35 am, "Santos, Jose Renato G" <joserenato.santos@xxxxxx> wrote: > > This is a set of patches to improve performance of find_domain_by_id(). > find_domain_by_id shows up high in profiles for network I/O intensive > workloads. > Most of the cost for this function comes from 3 main functions (of > aproximate equal costs): 1)read_lock(), 2)read_unlock() and > 3)get_domain(). > These patches replace the lock used for accessing domain_list and > domain_hash with a lock free RCU scheme. Experiments confirm that the > cost of find_domain_by_id() is in fact reduced by 2/3. > The patches apply cleanly to changeset 12732. Do you have numbers for performance improvement on a macro benchmark? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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