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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: EuOPIFOj+VgFSzO/bZz4U8FxnfSLTElBHWPf92/qfSK8m7z2yM7sjprk0tHrqRMlc0hLh1BOmjMXEOVUN2E+YQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR10MB6328 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-29_02,2025-01-29_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 bulkscore=0 suspectscore=0 mlxlogscore=999 phishscore=0 adultscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2411120000 definitions=main-2501290121 X-Proofpoint-GUID: kjt95xPkZDyJ7Hjv26rZYiCcI-dJ7xL4 X-Proofpoint-ORIG-GUID: kjt95xPkZDyJ7Hjv26rZYiCcI-dJ7xL4 On 1/29/25 2:32 AM, Cedric Blancher wrote: > On Wed, 22 Jan 2025 at 11:07, Cedric Blancher wrote: >> >> Good morning! >> >> IMO it might be good to increase RPCSVC_MAXPAYLOAD to at least 8M, >> giving the NFSv4.1 session mechanism some headroom for negotiation. >> For over a decade the default value is 1M (1*1024*1024u), which IMO >> causes problems with anything faster than 2500baseT. > > The 1MB limit was defined when 10base5/10baseT was the norm, and > 100baseT (100mbit) was "fast". > > Nowadays 1000baseT is the norm, 2500baseT is in premium *laptops*, and > 10000baseT is fast. > Just the 1MB limit is now in the way of EVERYTHING, including "large > send offload" and other acceleration features. > > So my suggestion is to increase the buffer to 4MB by default (2*2MB > hugepages on x86), and allow a tuneable to select up to 16MB. TL;DR: This has been on the long-term to-do list for NFSD for quite some time. We certainly want to support larger COMPOUNDs, but increasing RPCSVC_MAXPAYLOAD is only the first step. The biggest obstacle is the rq_pages[] array in struct svc_rqst. Today it has 259 entries. Quadrupling that would make the array itself multiple pages in size, and there's one of these for each nfsd thread. We are working on replacing the use of page arrays with folios, which would make this infrastructure significantly smaller and faster, but it depends on folio support in all the kernel APIs that NFSD makes use of. That situation continues to evolve. An equivalent issue exists in the Linux NFS client. Increasing this capability on the server without having a client that can make use of it doesn't seem wise. You can try increasing the value of RPCSVC_MAXPAYLOAD yourself and try some measurements to help make the case (and analyze the operational costs). I think we need some confidence that increasing the maximum payload size will not unduly impact small I/O. Re: a tunable: I'm not sure why someone would want to tune this number down from the maximum. You can control how much total memory the server consumes by reducing the number of nfsd threads. -- Chuck Lever