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nfsd41: bound forechannel drc size by memory usage

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By using the requested ca_maxresponsesize_cached * ca_maxresponses to bound
a forechannel drc request size, clients can tailor a session to usage.

For example, an I/O session (READ/WRITE only) can have a much smaller
ca_maxresponsesize_cached (for only WRITE compound responses) and a lot larger
ca_maxresponses to service a large in-flight data window.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Andy Adamson 2009-08-28 08:45:01 -04:00 • committed by J. Bruce Fields
parent a06b1261bd
commit a649637c73
2 changed files with 55 additions and 21 deletions
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8
include/linux/nfsd/state.h
View file

@ -92,13 +92,17 @@ struct nfs4_cb_conn {
struct rpc_cred * cb_cred;
};
/* Maximum number of slots per session. 128 is useful for long haul TCP */
#define NFSD_MAX_SLOTS_PER_SESSION 128
/* Maximum number of slots per session. 160 is useful for long haul TCP */
#define NFSD_MAX_SLOTS_PER_SESSION 160
/* Maximum number of pages per slot cache entry */
#define NFSD_PAGES_PER_SLOT 1
#define NFSD_SLOT_CACHE_SIZE PAGE_SIZE
/* Maximum number of operations per session compound */
#define NFSD_MAX_OPS_PER_COMPOUND 16
/* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
#define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
#define NFSD_MAX_MEM_PER_SESSION \
(NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
struct nfsd4_cache_entry {
__be32 ce_status;