Minutes of HelenOS online meeting 2024-05-09 ============================================
Attendees: JJ - Jakub Jermář JSv - Jiří Svoboda NK - Nataliia Korop Slip configuration discussion - http://www.helenos.org/wiki/UsersGuide/Networking#SLIPconfiguration Round table ----------- NK: Packet capture update/questions - currently we can select any NIC and capture Ethernet frames - the driver writes directly into a file - implemented in libnic - thinking about allowing capturing frames from multiple NICs at the same time - JS: Is this even supported in any other OS/tool? (Linux, Wireshark, snoop, etc.) - question: what are the net/ethN services? - JS: each net/ethN is an 'IP datalink' - it transports IP datagrams - JS: there is one net/ethN instance for each NIC. Although all are handled by the same task - question: Is there a place where we could capture frames from all NICs, where they are already multiplexed? - JS: Not really. You don't want to capture in the IP stack (ethip, inetsrv), because you would loose frames from NICs that are not running IP. in inetsrv you would also loose the ethernet headers. The correct solution would be to capture in each of the NICs and then combine the streams. E.g. have a capture tool that would connect to each NIC and pull data from them. Still is this even required? - question: I've found out that sometimes the name of the capture file contains garbage characters at the end. Is this a known bug? - JS/JS: Not as far as we know. - JS: Check your code if it correctly null-terminates the file name string - JJ: Try printing the name of the file being created, either as text or numeric character codes JJ: - No updates JSv: - release update - everything is ready for the release, just waiting for Martin to provide me with access to upload the files - disk benchmarks - random read and sequential read, added to hbench - 530 ops/s (~250 kB/s) on both with Qemu-kvm (slow!) likely because PIO is slow in KVM - ATA driver - the driver can now handle >512 B in a single I/O operation (multiple DRQ cycles) - implemented support for IRQs - frees up CPU to do other things while waiting for block to be read or written (small ~8% performance improvement in Qemu-kvm) - want DMA to make it faster - ISA IDE only supports PIO (ISA DMA is only used with floppy and PC-XT HDD controllers) - JJ: What in HelenOS uses ISA DMA? - JS: SoundBlaster driver - for DMA, need to add PCI IDE driver - the plan is to split generic ATA code to libata, then have two separate drivers, one for ISA and one for PCI - looked at SATA driver - doesn't look too bad, but seems there are some bugs to fix - need to remove proxy server (not needed anymore) - currently requires disk to support NCQ (could be a problem outside Qemu)
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