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[task #7890] Review heap usage
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[task #7890] Review heap usage
by Oleg Tyshev
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URL: <http://savannah.nongnu.org/task/?7890> Summary: Review heap usage Project: lwIP - A Lightweight TCP/IP stack Submitted by: goldsimon Submitted on: Mittwoch 26.03.2008 um 08:24 Category: None Should Start On: Mittwoch 26.03.2008 um 00:00 Should be Finished on: Mittwoch 26.03.2008 um 00:00 Priority: 5 - Normal Status: None Privacy: Public Percent Complete: 0% Assigned to: None Open/Closed: Open Discussion Lock: Any Planned Release: None Effort: 0.00 _______________________________________________________ Details: The idea for this came up in bug #3031: Implement a new fully pool-based pbuf implementation. Since PBUF_RAM can already/easily be changed to use pools, we should check the rest of the stack using mem_malloc directly: Maybe some parts can use static allocation (dhcp) or dedicated pools... _______________________________________________________ Reply to this item at: <http://savannah.nongnu.org/task/?7890> _______________________________________________ Nachricht geschickt von/durch Savannah http://savannah.nongnu.org/ _______________________________________________ lwip-devel mailing list lwip-devel@... http://lists.nongnu.org/mailman/listinfo/lwip-devel |
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[task #7890] Review heap usage
by Oleg Tyshev
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Update of task #7890 (project lwip): Priority: 5 - Normal => 3 - Low _______________________________________________________ Follow-up Comment #1: Remaining users of heap (that cannot be configured to use statically allocated memory) are: - netdb (16, 36 or 'namelen' of bytes -> 16 up to ~1460 bytes?) - snmp (16, 32, 28, value_len, array-of-u32_t, len(u8_t) -> anything between 1 and 255 bytes) - autoip (10 bytes) - dhcp (? 1 up to ~1460 bytes?) So, all in all, we have only few occurrences left. I can live with netdb, but the downside is that for dhcp and snmp, the maximum size is unknown. For dhcp (since boot_file_name is currently unused (why?)), it would be enough to have a netif_dhcp which reserves space for a struct dhcp, the maximum size of options_in and dhcp_msg. However, for snmp, I'm not sure :-( Note that I am not interested in 'allocate-once-on-startup' allocations but only in 'runtime-alloc-and-free' allocations to be able to minimize the heap size without risking fragmentation. To regard this as fixed, we can either - live with all the heap going into statically allocated pools or - solve dhcp and dig into snmp a bit or - a bit of both Is there anyone interested in this except for me? ;-) _______________________________________________________ Reply to this item at: <http://savannah.nongnu.org/task/?7890> _______________________________________________ Nachricht geschickt von/durch Savannah http://savannah.nongnu.org/ _______________________________________________ lwip-devel mailing list lwip-devel@... http://lists.nongnu.org/mailman/listinfo/lwip-devel |
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[task #7890] Review heap usage
by Oleg Tyshev
::
Rate this Message:
Update of task #7890 (project lwip): Percent Complete: 0% => 10% Assigned to: None => goldsimon _______________________________________________________ Follow-up Comment #2: Update: - autoip: doesn't count since it only allocates but doesn't free (memory is always reused) - netdb: only allocates one block of memory, could be easily converted to a memp pool (max name length would need to be configured for that) Remaining: - dhcp (struct dhcp could be re-used as in autoip) - snmp - netdb -> memp pool _______________________________________________________ Reply to this item at: <http://savannah.nongnu.org/task/?7890> _______________________________________________ Nachricht geschickt von/durch Savannah http://savannah.nongnu.org/ _______________________________________________ lwip-devel mailing list lwip-devel@... http://lists.nongnu.org/mailman/listinfo/lwip-devel |
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