[LU-905] keep BH reference on root node of IAM container Created: 08/Dec/11  Updated: 09/Dec/11  Resolved: 09/Dec/11

Status: Resolved
Project: Lustre
Component/s: None
Affects Version/s: Lustre 2.2.0
Fix Version/s: Lustre 2.2.0

Type: Improvement Priority: Minor
Reporter: Liang Zhen (Inactive) Assignee: Liang Zhen (Inactive)
Resolution: Duplicate Votes: 0
Labels: None

Story Points: 3
Rank (Obsolete): 10715

 Description   

IAM in ldiskfs-osd will always consume some slots in BH LRU (see: fs/buffer.c), if we keep buffer_head reference on root node, we can save one slot in BH LRU and could be somehow helpful for overall performance, I did some tests, LRU hits rate increased 5%-10% while creating files if we always keep this reference.



 Comments   
Comment by Liang Zhen (Inactive) [ 09/Dec/11 ]

Sorry I didn't remember that I've created a ticket for it, close it now

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